https://ojs.unimal.ac.id/acta-aquatica/issue/feedActa Aquatica: Aquatic Sciences Journal2023-12-01T09:05:05+07:00Prama Hartamiprama.hartami@unimal.ac.idOpen Journal Systems<p style="margin: 0px; text-align: justify;"><a title="p-ISSN" href="http://u.lipi.go.id/1413290211" target="_blank"><span style="margin: 0px; color: red; font-size: 8pt;"><em>p</em>-ISSN: 2406-9825</span></a></p><p style="margin: 0px; text-align: justify;"><a title="e-ISSN" href="http://u.lipi.go.id/1514947924" target="_blank"><span style="margin: 0px; color: red; font-size: 8pt;"><em>e</em>-ISSN: 2614-3178</span></a></p><p style="margin: 0px; text-align: justify;"><span style="margin: 0px; font-size: 9pt;"> </span></p><p style="margin: 0px; text-align: justify; word-spacing: 0px; orphans: 2; -webkit-text-stroke-width: 0px;"><span style="margin: 0px; word-spacing: 0px; orphans: 2; float: none; -webkit-text-stroke-width: 0px;"><span style="margin: 0px; font-size: 9pt;">Acta Aquatica: Aquatic Sciences Journal is a scientific open access journal in the field of aquatic sciences, published periodically (April, August, and December) by the Institute of Research and Community Service (LPPM) Universitas Malikussaleh (Malikussaleh University) in cooperation with Department of Aquaculture Universitas Malikussaleh. Acta aquatica are publish original research, overviews and reviews relating to aquatic environments and the border limits of these environmental systems and the impacts of human activities on the environmental systems. Acta Aquatica has a related studies in aquatic biotechnology, aquatic renewable energy, aquatic bioecology, aquaculture, hydrology, biodiversity of aquatic biosphere, exploitation and exploration <span>technology</span> of aquatic resources, fisheries product technology, aquatic microbiology, aquatic modeling, aquatic geographic information systems, and socio-economic of aquatic resources.</span></span></p>https://ojs.unimal.ac.id/acta-aquatica/article/view/8981The addition of pineapple waste extract in feed on the growth and survival of white shrimp (Litopenaeus vannamei)2023-12-01T09:04:44+07:00Sakinah Hasibuansakinah.3gcell@gmail.comSalamah Salamahsalamah@unimal.ac.idMainisa Mainisamainisa@unimal.ac.idMuhammad Hattamhatta@unimal.ac.idMunawwar Khalilnawar@unimal.ac.id<p>This study aims to reduce production costs for feed by adding the pineapple waste extract to commercial feed which increases feed utilization efficiency, relative growth rate, protein efficiency ratio, Survival rate, water quality, and Organoleptic Test. This research was conducted from March 31 to April 28, 2022. At the Hatchery and Technology Laboratory Faculty of Agriculture Department of Aquaculture. This study used a non-factorial Completely Randomized Design (CRD) consisting of four treatments and three replications. Treatment A (0% pineapple waste extract + 100 gr feed) B (3% pineapple waste extract + 100 gr feed) C (4% pineapple waste extract + 100 gr feed) D (5% pineapple waste extract + 100 gr feed). The best results from treatment C with feed utilization efficiency of 80.45%, relative growth rate of 4.79%/day and protein efficiency ratio of 1.73%/day. Survival 81,66% and Water Quality. Temperature 26 – 28 oC, DO 7,0 - 7,5 mg/L, pH 7,1 – 7,3, Salinity 32 ppt, Ammonia 0,04-0,08 mg/L. and Organoleptic Test of Color and Scent, the best feed has a very brown color and does not have an overpowering Scent.</p><p><em>Keywords: Growth</em><em>;</em><em> </em><em>Pineapple</em><em>; </em><em>Survival rate</em><em>;</em><em> </em><em>Vaname Shrimp.</em><em></em></p>2023-12-01T09:04:44+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/10717Analysis of water quality on growth performance bamboo lobster (Panulirus versicolor) in Tanjung Limau, Bontang City, East Kalimantan2023-12-01T09:04:46+07:00Soni Andriawansoniandriawan1992@gmail.comMohammad Adam Fahrezaadammfahreza@gmail.comHermawan Daviddavid@umm.ac.idHany Handajanihanyhandajaniumm@gmail.com<p><em>Lobster is one of the commodities that have high economic value in the world market. Thus, the export opportunities for lobster commodities are still promising. One area that can produce lobster in Indonesia is Bontang, East Kalimantan. The area which is the sea waters is very potential for lobster rearing cultivation. This study was conducted with the aim of analyzing good water quality in lobster rearing cultivation in Bontang, East Kalimantan. The study used 3 floating net cages by taking water samples 4 times and 5 lobsters each sampling. Water quality samples include physics (color, smell and taste, temperature, brightness), chemistry (pH, DO, nitrite, salinity), biology (coliform), heavy metals (hg, pb, cu). Lobster samples were measured by weight. The results showed that Fsignificant > 0.05 so that the water quality parameters had no effect on growth. The cause of the ineffectiveness of water quality parameters is due to the contamination of waters in Bontang, East Kalimantan.</em><em></em></p><p><em>Keywords: <em>Bamboo Lobster; Contamination; Floating Net Cage; Heavy Metal.</em></em></p>2023-12-01T09:04:46+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/11312Application of water hyacinth flour (Eichhornia crassipes) in artificial feed on the feed quality and feed conversion ratio for bileh fish (Rasbora sp.)2023-12-01T09:04:47+07:00Dini Islamadiniislama@utu.ac.idSufal Diansyahdiniislama@utu.ac.idFarah Dianadiniislama@utu.ac.idFazril Saputradiniislama@utu.ac.idFitria Rahmayantidiniislama@utu.ac.idJuliawati Juliawatidiniislama@utu.ac.id<p>This study aims to determine the effect of water hyacinth (Eichhornia crassipes) powder application on artificial feed on feed quality and feed conversion ratio for bileh fish (Rasbora sp.) fry. This research was carried out from September to October 2022 at UPR Mina Mandiri Gampong Lhok Seumot, Beutong District, Nagan Raya Regency. This study used bile fish seeds measuring 2 - 2.25 cm in length as test fish. The experimental design used was a non-factorial, Completely Randomized Design (CRD) with four treatments and three replications. The level of treatment applied in the feed formulation was control feed without fermented water hyacinth flour substitution (P0), 5% fermented hyacinth flour substitution in feed (P1), 10% fermented water hyacinth flour substitution in feed (P2), water hyacinth flour substitution fermented 15% in feed (P3). Feed is given at satiation three times a day. The test parameters observed were the quality of the feed produced and the feed conversion ratio of the seeds of bileh fish (Rasbora sp.). The results showed that applying water hyacinth flour (Eichhornia crassipes) on artificial feed gave the same response to the quality of the feed produced but had a significant effect on the feed conversion ratio for bileh fish. The lowest (best) feed conversion ratio was obtained in the P3 treatment.</p><p><em>Keywords: feed quality; feed conversion ratio; hyacinth flour; Rasbora sp.</em></p>2023-12-01T09:04:47+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/10154Assessment of antibiotics sensitivity of microbial isolates from fish hatcheries2023-12-01T09:04:49+07:00Abiola Durojaiyefadilatdurojaiye@oouagoiwoye.edu.ngO O Olajuigbefadilatdurojaiye@oouagoiwoye.edu.ngC E Oramadikefadilatdurojaiye@oouagoiwoye.edu.ngA K Ogunsanyafadilatdurojaiye@oouagoiwoye.edu.ng<p>The study assessed the antibiotics sensitivity of bacterial isolates from fish hatcheries. The result revealed that bacteria of public health importance were isolated, however, the TVC did not exceed 10<sup>5 </sup>CFU/g. A total of 16 isolates were detected. Thirteen (13) antibiotics recorded over 50% resistance, with the highest resistance (100%) observed in amoxicillin clavulanate (AUG). Ofloxime (OFX), gentamycin(GN) and levofloxacin (LBC) recorded the lowest resistance of 18.75%, 37.5% and 43.75% respectively. Only these antibiotics with least recorded resistance had susceptibility ranging between 50% (LBC) and 68.75% (OFX). The overall average resistance of the isolates to antibiotics was 68.75%; susceptibility 26.67% and intermediate 4.58%. Isolates 15 showed the highest resistance of 100%, followed by isolates 12 and 10 with 93.33% and 93.33% resistance, respectively. Resistance range of 60% to 86.67% was observed in isolates 2, 4, 5, 6, 7, 9, 13, 14, 16 and 17. Isolates 3, 8 and 11 had resistance below 50% ranging between 26.67% and 46.67%. The highest multiple antibiotic resistance index (MARI) was observed in isolate 15 with MARI of 1. Isolates 10 and 12 had MARI of 0.93. This was followed in descending order by isolates 2 and 9 (0.86), isolate 5 (0.8), isolate 14 (0.73), isolates 6 and 7 (0.67) and isolates 4, 13, 16 and 17 (0.6). The least MARI recorded were observed in isolates 3 and 11 (0.47) and isolate 8 (0.27), respectively. The emergence of antibiotic resistance on fish farms in Ijebu-Ode region calls for public health intervention strategies.</p><p><em>Keywords: antibiotic; fish health; isolates; resistance.</em></p>2023-12-01T09:04:49+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/11000Reproductive history of Cynoglossus senegalensis (Kaup, 1858) from coastal waters of Greater Accra, Ghana2023-12-01T09:04:50+07:00Samuel Amponsahsamuel.amponsah@uenr.edu.ghNii Amarquaye Commeysamuel.amponsah@uenr.edu.ghBerchie Asiedusamuel.amponsah@uenr.edu.ghPierre Faillersamuel.amponsah@uenr.edu.gh<p>Some life history aspects including the reproductive characteristics and population dynamics of Senegalese tongue sole (Cynoglossus Senegalensis, Kaup, 1858), in the coastal waters of Ghana, were studied between August 2018 and July 2019. The length data of 606 specimens from the coastal waters of the Greater Accra region of Ghana was analyzed for size structure, growth pattern, condition factor, sex ratio and length at first maturity. The mean length varied significantly (p -value < 0 .001) with sex (31.3 ± 0.4 cm in males, 34.3 ± 0.4 cm in females). Condition factor (K) did not vary significantly (p -value = 0.054) with sex (i.e. 0.466 ± 0.002 in males, 0.476 ± 0.004 in females). The gonadosomatic index (GSI) varied significantly p -value < 0 .001) with sex (2.29 ± 0.30 in males), (3.94 ± 0.25 in females) and spawning peaks in April and July. Five maturity stages were recorded for both sexes with the size at first maturity for females and males estimated at 44.1 cm and 38.3 cm, respectively. In conclusion, the assessed fish species is likely to experience recruitment failure in the future, if appropriate management measures are not in place. Reduction in fishing efforts ad establishment of closed season is highly recommended.</p><p><em>Keywords: Cynoglossus senegalensis; Ghana; Growth; Fisheries management; Life history.</em></p>2023-12-01T09:04:50+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/12315The effect of commercial feeds with different protein content on the growth and survival of tiger shrimp fry (Penaeus monodon)2023-12-01T09:04:51+07:00Andri Sihombingandrisihombing@gmail.comSuri Purnama Febrisuripurnamafebri@unsam.ac.idMuhammad Fauzan Ismafauzanisma@unsam.ac.idTeuku Fadlon Haserteukufadlon@unsam.ac.idSuraiya Nazliasuraiyanazlia@usk.ac.idIka Rezvani Apritaikarezvaniaprita@poliven.ac.idRachmawaty Rusydirachmawatyrusydi@unimal.ac.idMuh Saleh Nurdinmuh.salehnurdin@tadulako.ac.id<p>In Aceh Province, tiger prawns (Penaeus monodon) are one of the main commodities of farmers for cultivation. Feed is one of the factors that can support the development of tiger prawn culture. The quality feed is feed that contains essential nutrients in sufficient quantities, one of which is protein. This study aims to determine the effect of commercial feed with different protein content on the growth and survival of tiger prawn fry. This study used a completely randomized design (CRD) method consisting of 3 treatments and 4 repetitions, namely P1 (using 40% protein feed), P2 (using 35% protein feed), and P3 (using 26% protein feed). The results showed that commercial feed with different protein content had an effect on active weight growth and feed conversion ratio, but had no effect on tiger prawn survival. Furthermore, the best protein content for the growth and survival of tiger prawn was obtained, namely 40%.</p><p><em>Keywords: commercial feed; growth; protein; survival rate; tiger prawn.</em></p>2023-12-01T09:04:51+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/11373Reproductive performance of snakehead fish (Channa striata) induced by oodev hormone2023-12-01T09:04:53+07:00Rievika Nur Deliarievikadelia11@gmail.comNuraini Nurainirievikadelia11@gmail.comNetti Aryanirievikadelia11@gmail.comBenny Heltonikarievikadelia11@gmail.com<p>Snakehead fish is a fish that has a high level of consumption and has many benefits in the health sector, but cultivation activities have not been carried out intensively because of the availability of snakehead fish which still utilizes catches from nature. In cultivation activities, the use of hormones is commonly used, one of which is used to support reproductive performance. One of them is the Oodev hormone, so this study aimed to determine the effect of Oodev with different doses on the final gonad maturation of snakehead fish. The research method used was a completely randomized design experiment with four treatments and three replications. The treatments were P0 (Oodev 0 mL/kg), P1 (Oodev 0.5 mL/kg), P2 (Oodev 1 mL/kg), P3 (Oodev 1.5 mL/kg). Oodev injections were carried out on TKG II fish at an interval of every 7 days. During maintenance, the fish were fed golden snails and small fish 2 times a day. The result of the research showed that Oodev is significant in the gonad maturation of common snakehead. The treatment P3 injection dose of 1.5 mL/kg with maturation gonad time for 16 days, ovi somatic index 4.26%, egg diameter increases of 0.113 mm, fertilization rate 91.43%, hatching rate 90.96. It was concluded that the Oodev injection had a significant effect on the gonad maturity of snakehead fish (P<0.05) in the P3 treatment (Oodev 1.5 mL/kg).</p><p><em>Keywords: Channa striata; Dose; Gonad maturation; Hormone; Oodev</em></p>2023-12-01T09:04:53+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/11752Coculture of aquatic animals and paddy in brackish water: Evaluation of the growth of daily growth and morphometrics of tilapia (Oreochromis niloticus) as a fed species2023-12-01T09:04:54+07:00Heriansah Heriansahheriansah.itbm.bd@gmail.comArnold Kabangngaarnold@itbm.ac.idNur Fajriani Nursidanurfajrianinursida@gmail.comRenal Renalheriansah.itbm.bd@gmail.comMuh. Izzul Alfarifdiheriansah.itbm.bd@gmail.com<p>A study on the cultivation of tilapia (Oreochromis niloticus) in brackish water using co-culture systems (polyculture, IMTA-non paddy, and IMTA-paddy) and monoculture systems was evaluated on a laboratory scale to determine its growth. Several species of aquatic animals and paddy (floating system) were combined with tilapia reared in plastic tanks for 28 days. Tilapia were fed four times a day at a feeding rate of 10% of biomass. The highest specific growth rate (SGR), IMTA-paddy system (4.24±0.08% day-1), polyculture (4.13±0.06% day-1), IMTA-non paddy (3.84±0.23% day-1), and monoculture (3.80±0.05% day-1). The same pattern was found in the addition of morphometric characteristics (AMC). Total length, standard length, body length, and height respectively from the highest IMTA-paddy system (2.49±0.12; 2.14±0.12; 1.81±0.14; 0.49±0.19 g), polyculture (2.32±0.16; 2.07±0.09; 1.72±0.11; 0.41±0.11 g), IMTA-non paddy (2.18±0.12; 1.78±0.15; 1.62±0.15; 0.33±0.14 g), and monoculture (2.02±0,09 1.67±0.08; 1.57±0.08; 0.30±0.10 g). Analysis of variance indicated that SGR and AMC of tilapia were significantly influenced by the culture system (P<0.05). The SGR and AMC in the IMTA-paddy system were significantly higher (P<0.05) than those in the monoculture and IMTA-non-paddy systems, but not significantly different (P>0.05) from those in the polyculture system. In general, tilapia growth was higher in co-culture systems than in monoculture systems in brackish water, which led to the diversification of aquaculture production.</p><p><em>Keywords: Brackish water; Co-culture; Growth; Nile tilapia; Rice.</em></p>2023-12-01T09:04:54+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/12200Application of liquid organic fertilizer from wild banana stem waste (Musa acuminate) and coconut husk as a culture medium for Spirulina platensis2023-12-01T09:04:55+07:00Rubiyah Rubiyahrubiyah@gmail.comMuliani Mulianimuliani@unimal.ac.idMahdaliana Mahdalianamahdaliana@unimal.ac.idRachmawati Rusydirachmawati.rusydi@unimal.ac.idMainisa Mainisamainisa@unimal.ac.id<p>Microalgae are single-celled microorganisms with pigments and can produce photosynthesis to produce food and oxygen. The addition of liquid organic fertilizer from wild banana stem waste (Musa acuminata) and coconut husk as a source of nutrients can be used to increase the cell density of Spirulina platensis. This research was conducted on September 18-27 at the Hatchery and Aquaculture Technology Laboratory, Aquaculture Study Program, Department of Fisheries and Marine, Faculty of Agriculture, Malikussaleh University. The method used in this study is an experimental method with a non-factorial Complete Randomized Design (RAL) of 5 treatments and 3 repeats. The study is treatment A Control (Walne fertilizer), treatment B (Mixture of POC Waste of forest banana stems and coconut husk 12 ml / L of sea water), treatment C (Mixture of POC Waste of forest banana stems and coconut husk 14 ml / L of seawater), treatment D (Mixture of POC Waste of forest banana stems and coconut husk 16 ml / L of seawater), treatment E (Mixture of POC Forest banana stem waste and coconut husk 18 ml/L seawater). The results of this study showed that the use of POC from forest banana stem waste and coconut husk as a culture medium for Spirulina platensis had a real effect with F calculate 43,850 > F tabel (0.05) 3.48 to the peak population and had a real effect on the growth rate of Spirulina platensis with F calculate (26,884) > F table (0.05) 3.48.</p><p><em>Keywords: Coconut husk; POC; Spirulina platensis; Wild banana stem waste.</em></p>2023-12-01T09:04:55+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/12217Effectiveness of viterna supplements in feed to speed growth and minimize feed conversion rate in Batak fish seeds (Neolissochilus thienemanni)2023-12-01T09:04:57+07:00Anne Rumondangannelumbanbatu@gmail.comMuhammad Aidil Hudaannelumbanbatu@gmail.comMarta Laura Butar Butarannelumbanbatu@gmail.com<p align="justify"><span style="font-size: 10px;">Batak fish (Neolissochilus thienemanni) is a type of fish endemic to North Sumatra which is categorized as endangered by the IUCN (International Union for Conservation of Natural) (IUCN, 2017). This fish is a type of fish that has quite high economic value but its growth rate is relatively slow. One way to stimulate the growth of this fish is to increase the nutrition of the feed by using viterna supplements. Viterna is a supplement derived from various natural ingredients which is useful for increasing the nutritional content of feed, increasing appetite, increasing endurance, stimulating digestive enzymes and accelerating fish growth. The aim of this research was to determine the effect of adding viterna supplements to feed on the specific growth rate (SGR) and Feed Conversion Ratio (FCR) of Batak fish fry. This research was conducted from July to August 2022 at the P2MKP Ampibi Padang Lancat Center, South Tapanuli Regency. Viterna supplements are given with 4 different treatments, namely P0 (Control), P1 (10 ml/kg), P2 (15 ml/kg), P3 (20 ml/kg). Fish were fed ad-satiation with a frequency of 3 times/day. The research was carried out for 50 days with sample data taken every 10 days. The results of the research showed that the highest specific growth rate of Batak fish seeds was in the P3 treatment at 0.65%. The lowest feed conversion yield (FCR) of Batak fish seeds obtained during the research was in the P3 treatment at 2.33.</span></p><p align="justify"><em><span>Keywords: Batak Fish, FCR; SGR; Viterna.</span></em></p>2023-12-01T09:04:57+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/12598Tourism suitability and community perception on development of the Cengklik Reservoir tourism, Boyolali Regency2023-12-01T09:04:58+07:00Nur Salsabila Firdausnursalsabilafirdaus@gmail.comFrida Purwantifrpurwanti@gmail.comDiah Ayuningrumdiahayuningrum21@lecturer.undip.ac.idBambang Sulardionobambangsulardiono@gmail.com<p>Cengklik Reservoir is one of the water and waterfront tourism destinations in the Boyolali Regency which has an area of 327,44 ha. The condition of Cengklik Reservoir is currently undergoing revitalization and tourism development. The purpose of this study was to analyse the suitability of reservoir waters as a tourist attraction based on the Tourism Suitability Index, to determine the perceptions of tourists’ potential in the reservoir, and community perceptions of tourism development in the reservoir. The research was conducted in March - April 2023. The research methods used a case study with quantitative analysis to calculate the value of the Tourism Suitability Index and qualitative analysis to determine the perception of tourism potential from 30 tourist respondents and tourism development from 30 community respondents. Results of the TSI calculation of the Cengklik Reservoir for boat tours amounted to 2.40 (suitable) and fishing amounted to 3.00 (very suitable). The tourists’ perception of the Cengklik Reservoir as well as the community’s perception of tourism development were rated positively. These results indicate that the Cengklik Reservoir is suitable for tourism which is supported by the community’s perception of the tourist development</p><p><em>Keywords: Cengklik Reservoir; Tourism Development; Tourism Potential; Tourism Suitability Index.</em></p>2023-12-01T09:04:58+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/12500Growth performance and stress response of serukan juvenile (Osteochilus sp) in different salinity media2023-12-01T09:05:00+07:00Khairul Samukikhairulsamuki@utu.ac.idFarah Dianafarahdiana@utu.ac.idDini Islamadiniislama@gmail.comAfrizal Hendrihendri2020@gmail.comM Barru Airil Fizra Hasibuanairilfizra16@gmail.comAris Yusdiarisyusdi3311@gmail.comFazril Saputrafazrilsaputra@utu.ac.id<p>Serukan fish (Osteochilus sp) has potential as a cultivation commodity with economic value. Environmental engineering, such as the manipulation of salinity media, has succeeded in increasing the growth of freshwater fish. However, there is no information about the optimal salinity setting for raising serukan fish. This study aims to determine the optimal media salinity based on the growth performance of the serukan juvenile. This study used a completely randomized design (RAL) with four treatments and three replications. The maintenance media in this study included control, P1 (3 ppt), P2 (6 ppt) and P3 (9 ppt). The study was conducted for 45 days with commercial feed. The test parameters included feed chemical analysis, blood glucose, SGR, FI, FE and SR. Data were analyzed by ANOVA and Duncan's further test. The optimal concentration of media salinity is determined by an orthogonal polynomial test. The results showed that the salinity-rearing media had a significant effect on the specific growth rate (SGR) and the efficiency of feed usage. The optimal concentration of salinity was found at 3.8 ppt, indicating that the fish call tends to achieve optimal growth at this salinity. The physiological response (stress) of fish, as measured by blood glucose levels, is also directly proportional to the level of salinity and growth performance.</p><p><em>Keywords: Blood glucose; Growth performance; Media manipulation; Osteochilus sp; Stress response.</em></p>2023-12-01T09:05:00+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/11430Assessment of some heavy metal content in sediments of a mangrove swamp, niger delta, nigeria using applicable ecological risk indices2023-12-01T09:05:01+07:00Davies Ibienebo Chrisdavies.chris@uniport.edu.ngEmeka Donald Anyanwuekadon@yahoo.com<p>Sediments can act as pollutant sinks and a source of pollution in aquatic environments. The surface sediments of the Isaka–Bundu tidal swamp, Niger Delta was assessed for heavy metal content using standard methods and assessment indices. The study was carried out in three stations between January and June 2022. Five heavy metals (lead, copper, cadmium, nickel and zinc) were evaluated while eight assessment indices (Contamination Factor - CF, degree of contamination - DC, Ecological Risk - Er, Potential Ecological Risk - PERI, Pollution Load Index - PLI, Enrichment Factor - EF, Geo-accumulation Index - Igeo and Quantification of Contamination -QoC) were applied. Results showed that cadmium and copper exceeded permissible limits while lead, zinc and nickel were within limits. Stations 1 and 3 recorded significantly higher values indicating anthropogenic influence. The dominant anthropogenic activities observed in the area include maritime and dockyard activities and artisanal crude oil refinery. The assessment indices showed that the sediments were at various levels of heavy metal pollution mainly influenced by copper and cadmium viz: CF: Cu (considerable degree) and Cd (very high degree), DC (very high degree), Er: Cd (high ecological risk) and Cu (very high ecological risk), PERI (significant high ecological risk), PLI (very high level pollution), EF: Pb, Zn, Cu (Station 1) and all Cd (extremely high enrichment), Igeo: Cd (extremely polluted) and QoC: Cu and Cd (anthropogenic source). The sediments were highly polluted with toxic metals, which is detrimental to humans and aquatic biota.</p><p><em>Keywords: Heavy metal; Indices; Mangrove; Niger Delta; Sediment.</em></p>2023-12-01T09:05:01+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/11812Identification of marine debris at Avicennia mangrove root in Pangandaran Beach, West Java2023-12-01T09:05:03+07:00Liana Chusnul Chotimahlianachusnul520@gmail.comYuniarti MSyuniarti@unpad.ac.idYuli Andrianiyuli.andriani@unpad.ac.idIbnu Faizalibnu.faizal@unpad.ac.idNanda Radhitia Prasetiawannr.prasetiawan@gmail.com<p>This research was carried out in Pangandaran Regency, specifically in the Batukaras, Nusawiru, and Bojongsalawe areas, in March–April 2022. This research to determine the characteristics of Avicennia type mangroves, habitat characteristics, and the ability of Avicennia type mangrove roots to trap debris. The method used is the Line Transect (LT) method. The results obtained from research on the characteristics of this type of Avicennia mangrove include that the circumference of mangrove roots ranges from 2–24 cm, the height of mangrove roots ranges from 3-83 cm, and the number of mangrove roots ranges from 925–2988 roots. The wider the area, the more debris you will find. Based on the results of the calculation of the characteristics of the Avicennia-type mangrove habitat in Pangandaran, it is in a good range. The calculations include salinity in the range of 15–22 ppt, a temperature of 32–34 °C, a pH value of 7,6–8, and DO (dissolved oxygen) of 4–4,5 mg/L. The trapping of waste in the Avicennia root area is categorized as strong. So the denser the mangrove roots are, the density of debris will increase. This is proven by the large amount of debris found in Batukaras.</p><p><br /><em>Keywords: Avicennia mangrove; Characteristics, Category, Density, Marine debris; Type.</em></p>2023-12-01T09:05:03+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journalhttps://ojs.unimal.ac.id/acta-aquatica/article/view/12957The last observation of the long-spined exotic Sea Urchin (Diadema setosum) in the Gulf of Antalya2023-12-01T09:05:04+07:00Mehmet Gokoglugokoglu@akdeniz.edu.trFerhat Çağıltayferfez@istanbul.edu.trMustafa Gürdalgurdal1297@gmail.comAlper Yıldızalperyildiz@akdeniz.edu.tr<p>Diadema setosum, a Red Sea migrant, was first identified on the shores of the Kaş Peninsula in the Mediterranean. Approximately a year after this observation, the same species was reported for the second time from Konyaaltı Beach in Antalya Bay. This sea urchin rapidly multiplied and expanded its distribution along the coasts of the Mediterranean and Aegean Seas, reaching as far as the Marmara Sea. Some individuals of this sea urchin, which expanded distribution to coastal areas posing a risk to swimmers, were observed to start dying in the summer months of 2022. Scuba diving surveys were conducted in five different areas with rocky and stony seabed structures in the Gulf of Antalya during the winter season (Cliffs, Konyaaltı Beach, Sıçan Island surroundings, Çaltıcak region, and Kemer Ağva Cape), and it was determined that 99% of the D. setosum population had died in February and March. No living individuals were encountered during scuba diving surveys conducted in the same stations in April and May. In conclusion; mass mortalities have occurred in the D. setosum population in the rocky areas of the Gulf of Antalya, including the cliffs, Konyaaltı beach, Sıçan island surroundings, Caltıcak region, and Kemer Ağva Cape. This study presents the first report on matter.</p><p>Keywords: Diadema setosum; Gulf of Antalya; Sea urchin.</p>2023-12-01T09:05:04+07:00Copyright (c) 2023 Acta Aquatica: Aquatic Sciences Journal