Aquatic Living Resources最新文献

{"title":"Supplementation of biofloc in carp (Cyprinus carpio var. Communis) culture as a potential tool of resource management in aquaculture","authors":"Shib Kinkar Das ,&nbsp;Amit Mandal ,&nbsp;Joel Aubin","doi":"10.1051/alr/2021019","DOIUrl":"10.1051/alr/2021019","url":null,"abstract":"<div><div>Supplementation of biofloc in rearing of common carp (<em>Cyprinus carpio</em> var. <em>Communis</em> (0.84 ± 0.003 g) was tested in replacing costly feed and environmental amelioration. Neem (<em>Azadirachta indica</em>) leave extract in biofloc media has beenknown to be beneficial in controlling pathogenic <em>Vibrio</em> sp. in brackish water shrimp. Two studies were conducted for 120 days in outdoor experimental cisterns with reduction of feed from 50% to 100%, with two biofloc media; without (Experiment 1; E1) and with neem extract (Experiment 2; E2). The experimental groups were: biofloc with feeding at 6% body weight (T1E1 and T1E2), biofloc with feeding at 3% body weight (T2E1 and T2E2), biofloc without feeding (T3E1 and T3E2), feeding at 6% body weight (C1) and only biofloc (C2E1 and C2E2). Absolute weight gain in T2E1 (9.96 g) was 8.23% and in T2E2 (9.56 g) was 4.39% higher than C1 (9.14). In spite of 5.04% and 13.98% higher growth respectively in T1E1 (10.50 g) and T1E2 (11.66 g) than C1 (9.97 g), BFT could not compensate the total withdrawal of feed (T3E1 and T3E2) and resulted in 22.22% to 33.33% mortality in T3E2 and T3E1 respectively. Under identical feeding regime, FCR was improved by 52.57% to 53.76% in T2E1 (1.84) and 48.71% to 51.23% in T2E2 (1.99) compared to T1E1 (3.98) and T1E2 (4.08). Absolute weight gain in T2E1 was 8.97 times and in T2E2 was 4.63 times higher than C1. In spite of 18.54% and 7.26% higher growth respectively in T1E1 and T1E2 than C1, BFT could not compensate the total withdrawal of feed (T3E1 and T3E2) and resulted in 22.22% to 33.33% mortality in T3E2 and T3E1 respectively. Under identical feeding regime, FCR was improved by 52.57% to 53.76% in T2E1 and 48.71% to 51.23% in T2E2 compared to T1E1 and T1E2 respectively. Increased N: P ratio of water and soil in E2 favoured fish growth. Neem leave extract in biofloc media should be judicious as it may cause nitrification inhibition.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of use effective microorganisms (EM) with different feeding strategies on growth performance, body chemical composition and economic efficiency of monosex Nile tilapia Oreochromis niloticus juveniles","authors":"Mohamed F. Abdel-Aziz ,&nbsp;Yaseen A. Abdel-Tawwab ,&nbsp;Mohamed F. Sadek ,&nbsp;Abdel Moneim M. Yones ,&nbsp;Jacques Slembrouck","doi":"10.1051/alr/2021021","DOIUrl":"10.1051/alr/2021021","url":null,"abstract":"<div><div>A factorial trial was conducted to detect the effect of different feeding strategies of supplementation of effective microorganisms (EM) liquid on the growth performance, feed utilization, body chemical composition and economic efficiency of monosex Nile tilapia (<em>Oreochromis niloticus</em>) juveniles. Three experimental treatments were formulated a basal diet without any addition of EM (control; A), a diet supplemented with 2% EM (B), and a diet supplemented with 4% EM (C). All treatments were offered to fish through two different strategies of feeding the meal: 2/3 in the morning and 1/3 in the afternoon or 1/3 in the morning and 2/3 in the afternoon. Each treatment was replicated three times. Juveniles Nile tilapia with an average initial body weight of 3.85 ± 0.22 g (± SE) were randomly stocked at a rate of 90 juveniles per 1.5 m³ tank. Fish growth performance and feed utilization significantly (<em>P</em> ≤ 0.05) increased with increasing EM supplementation and were positively affected by different feeding strategies. Moreover, the economic evaluation showed that there were more benefits by when using the 4% EM diet and feeding 2/3 of daily meal in the morning.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic variation of Parapenaeopsis sculptilis (Decapoda, Penaeidae) and reassessment of the phylogenetic relationships within the genus Parapenaeopsis based on mitochondrial DNA variation","authors":"M. M. Mahbub Alam ,&nbsp;Snæbjörn Pálsson ,&nbsp;Carlos Saavedra","doi":"10.1051/alr/2020027","DOIUrl":"10.1051/alr/2020027","url":null,"abstract":"<div><div>The genus <em>Parapenaeopsis</em> is an important group of marine shrimps for wild capture in the Indo-West Pacific region. Phylogenetics of penaeid shrimps is still a debatable issue. This study focuses on the phylogenetic relationships among seven species within the genus <em>Parapenaeupsis</em>, the population genetic variation of <em>Parapenaeupsis sculptilis</em> along Bangladesh coastline of the Bay of Bengal and the phylogeography of <em>P. sculptilis</em> in the Indian Ocean region by analysing cytochrome oxidase subunit 1 barcode (CO1) sequence. No population structure was detected in <em>P. sculptilis</em> collected from two sampling sites along the Bangladesh coastline (AMOVA and <em>Φ</em> _ST = ‑0.014, <em>p</em> &gt; 0.05; <em>F</em> _ST = 0.061, <em>p</em> = 0.04), which expanded first around 73 (CI: 36‑119) kyr ago. The genealogical relationships in Bangladesh <em>P. sculptilis</em> population are shallow with haplotype diversity (<em>h</em>) of 0.58 and nucleotide diversity (<em>π</em>) of 0.0014. The different <em>P. sculptilis</em> samples from Bangladesh, India and Mozambique of the Indian Ocean revealed connectivity between western Indian Ocean and the Bay of Bengal. The phylogeny within the genus <em>Parapenaeupsis</em> showed a polyphyletic relationships for <em>P. hardickwii</em> and its taxonomy needs to be reevaluated. The study will help for genetic upgradation in aquaculture and monitoring of the population genetic diversity of <em>P. sculptilis</em>.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using length data to derive biological reference points for kiddi shrimp Parapenaeopsis stylifera (Milne Edwards, 1837) from the south-eastern Arabian Sea, India","authors":"Saraswathy Lakshmi Pillai ,&nbsp;Gidda Maheswarudu ,&nbsp;Ponnathara Kandankoran Baby ,&nbsp;Madavan Radhakrishnan ,&nbsp;Nadakkal Ragesh ,&nbsp;Lakshmanan Sreesanth ,&nbsp;AE David Kaplan","doi":"10.1051/alr/2021003","DOIUrl":"10.1051/alr/2021003","url":null,"abstract":"<div><div><em>Parapenaeopsis stylifera</em>, a major commercial penaeid shrimp fishery resource in the Indian Ocean, has lacked adequate information on life history parameters for nearly two decades. In this study, growth and mortality parameters of <em>P. stylifera</em> from the southwest coast of India were estimated using length data and used to derive biological reference points for the species. The asymptotic length for females was L_∞ = 131 mm; k = 1.1 y⁻¹ and for males L_∞ = 117 mm; k = 1.25 y⁻¹. Mortality parameter estimates were Z = 4.42, M = 1.24, F = 3.18 y⁻¹ and exploitation rate E = 0.72 for females; Z = 5.76, M = 1.39, F = 4.37 y⁻¹ and E = 0.76 for males. Thomson and Bell yield biomass, Beverton and Holt yield per recruit, and relative yield per recruit models were applied to predict the stock status and length cohort analysis for estimating the stock size. The Beverton and Holt analysis gave E_max = 0.69 in females and 0.75 for males, which is below the E_current values obtained for the sexes. The Thomson and Bell analysis indicated that if F_current at which the yield is 121 460 t in females and in males 128 064 t is further increased, rise in yield will be modest. B/B₀ and SB/SB₀ at F_current were 24% and 18% for females and 21% and 16% for males, respectively. Target reference point F_0.1 and F_0.5 at different levels of age at capture t_c (0.5, 0.6, 0.7 and 0.8 yrs) was estimated by Beverton and Holt yield per recruit model. The outcome from these models forms integral inputs for multispecies/multigear tropical fisheries management. <em>Parapenaeopsis stylifera</em> is one of the inshore penaeid shrimp identified by the Marine Stewardship Council for certification from the region and, moreover, biological reference points are a prerequisite to assessment and management of tropical multispecies fisheries for ecosystem-based fisheries management.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Real Time PCR detection of Macrobrachium rosenbergii (de Man, 1879) larvae with emphasis to their ecology","authors":"Mahadevan Harikrishnan ,&nbsp;Deepak Jose ,&nbsp;B. Nidhin ,&nbsp;K.P. Anilkumar ,&nbsp;Antonio Figueras","doi":"10.1051/alr/2021012","DOIUrl":"10.1051/alr/2021012","url":null,"abstract":"<div><div>Species specific identification of early larval stages of many decapod crustaceans sampled from plankton collections remains cumbersome owing to lack of distinguishable characteristics, where DNA based molecular methods provide accurate results without taxonomic ambiguities. In the present study, an attempt was made to detect temporal occurrence of early zoea of freshwater prawn <em>Macrobrachium rosenbergii</em> (de Man) using real-time PCR assays in polyhaline, mesohaline and oligohaline areas of a tropical positive estuary, the Vembanad lake (S. India). High caridean larval abundance could be recorded in polyhaline areas in all seasons while it could be recorded in monsoon season in mesohaline and oligohaline areas. 113 DNA isolations were successfully made from morphologically identified taxonomic units (MOTU) and SYBR Green based RT-PCR amplifications using designed primer for <em>M. rosenbergii</em> yielded positive detections in 38 samples (34%) representing all seasons in all three zones. Positive detections could be recorded in all months except May in mesohaline areas and differed significantly (F = 17.2 p &lt; 0.01) with the same in polyhaline and oligohaline areas. The present results of molecular detection of <em>M. rosenbergii</em> larvae extend confirmation of its breeding ground in Vembanad lake where appropriate management strategies could be enforced for stock conservation of this species.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Changes in age and maturity of anadromous whitefish (Coregonus lavaretus) in the northern Baltic Sea from 1998 to 2014","authors":"Lari Veneranta ,&nbsp;Irma Kallio-Nyberg ,&nbsp;Irma Saloniemi ,&nbsp;Erkki Jokikokko ,&nbsp;AE Richard Nash","doi":"10.1051/alr/2021007","DOIUrl":"10.1051/alr/2021007","url":null,"abstract":"<div><div>The maturation of anadromous whitefish (<em>Coregonus lavaretus</em>) was analysed from samples taken from commercial coastal fishing in 1998–2014 in the Gulf of Bothnia. Whitefish matured at a younger age from year to year. The proportion of older (5–12 sea years) mature males decreased from 79% to 39% in the northern Gulf of Bothnia (66°N–64°N) and from 76% to 14% in southern (64°N–60°30'N) during the study period. At the same time, the proportion of young males (2–4 sea years) increased. Whitefish matured younger: the proportion of mature fish at age four increased in both the north and south among females (13% → 98%; 6% → 85%) and males (68% → 99%; 29% → 89%). The catch length of four-year-old fish increased during the study period in both sexes. In contrast, the length of six-year-old females decreased from year to year. Sea surface temperatures increased during the study period, and were possibly associated with a decrease in the age of maturation and faster growth.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental amelioration in biofloc based rearing system of white leg shrimp (Litopenaeus vannamei) in West Bengal, India","authors":"Shib Kinkar Das ,&nbsp;Amit Mandal ,&nbsp;Domenico Caruso","doi":"10.1051/alr/2021016","DOIUrl":"10.1051/alr/2021016","url":null,"abstract":"<div><div>The potential of biofloc media in <em>in-situ</em> environmental amelioration mediated through the removal of nitrogenous metabolites, reduce the dominance of disease-causing <em>Vibrio</em> to beneficial <em>Bacillus</em> community and reduction of costly commercial feed was investigated in white leg shellfish (<em>Litopenaeus vannamei</em>) farming. Three treatments viz. biofloc without neem + commercial feed (B), biofloc with neem +commercial feed (NB), only commercial feed without biofloc (F)and, one control (C) withno biofloc and no feed in triplicate was applied with a stocking density of 60 PL-20 m⁻³ in outdoor earthen ponds (1000 m³). Two biofloc media (C:N = 15–10:1) with and without neem leave extract were applied with reduction of feed supplement from 50% to 100%. The significant difference was observed in final body weight (33.82 ± 0.18 g) in neem based biofloc media than the other tested shrimp with the survival percentage above 87%. Superiority of biofloc based rearing system over the traditional feed based one was established as live weight gain was 28.48–137% more with a reduction of feed conversion ratio by 7.60% to 8.18% in the former. Moreover, feed cost was reduced both in B (8.1%) and NB (8.77%) compared to conventional feed −based culture system (F). The nutrient profile of floc and shrimp also improved as higher protein content was recorded in floc (18.65–19.63%) and shrimp (24.58–26.29%). The development of biofloc within the culture system resulted in cumulative increase of <em>Bacillus</em> population with concomitant decrease of luminous <em>Vibrio</em> population. The findings of the study strongly indicated that biofloc technology could be a potential tool of ecosystem approach towards <em>in-situ</em> environmental amelioration in shrimp farming ponds with substantial reduction of cost towards feed, aqua chemicals used for disease and environmental health management and other operational cost like water exchange.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Introgressive hybridization between two close species Siniperca chuatsi and Siniperca kneri (Percomorpharia: Sinipercidae) in the Middle Reaches of the Yangtze River","authors":"Shuqin Zhu ,&nbsp;Chenhong Li ,&nbsp;Jinliang Zhao ,&nbsp;Roman Wenne","doi":"10.1051/alr/2021001","DOIUrl":"10.1051/alr/2021001","url":null,"abstract":"<div><div><em>Siniperca chuatsi</em> and <em>Siniperca kneri</em> are two economically important freshwater fishes endemic to East Asia. Recently, some <em>Siniperca</em> specimens collected from Lake Poyang and Lake Dongting in the middle reaches of the Yangtze River couldn't be clearly identified as they showed intermediate morphological characteristics between <em>S. chuatsi</em> and <em>S. kneri,</em> and some inter-species hybrids were detected by microsatellite loci. To further verify genetic composition of these intermediate individuals, and determine the prevalence and degree of introgression between the two <em>Siniperca</em> species, a large set of high-quality, independent, diagnostic genetic markers were necessarily required. Based on enrichment and sequencing of target genes in sinipercid fishes, 463 loci (F_ST = 1) between <em>S. chuatsi</em> and <em>S. kneri</em> were selected and verified for species diagnosis. A total of 349 loci with 458 diagnostic SNPs were identified for discriminating <em>S. chuatsi</em> and <em>S. kneri</em>. From those markers, 224 diagnostic SNPs (only one SNP per locus) were selected to identify and categorize 48 specimens with intermediate morphological characters. The results showed that there were 8 specimens identified as hybrids, 8 specimens as <em>S. chuatsi</em> and 32 specimens as <em>S. kneri.</em> NEWHYBRIDS analysis showed that the hybrid offsprings were composed of the first-generation hybrid (2 individuals), first-generation backcross (1 individual), second-generation backcross (1 individual) and fourth-generation backcross (4 individuals), and the backcrossing could happen to both <em>S. chuatsi</em> and <em>S. kneri</em>. These hybrids could occur naturally, or escaped from farmed fish, due to extensive artificial breeding practice in these regions. However, the origin of the introgressive hybridization can't be easily traced. Therefore, some measures for protecting genetic resource of <em>Siniperca</em> speies in the Yangtze River should be enforced, such as assessing genetic background of the cultured stocks, reducing the escapement from farmed fish, and monitoring the trend of introgressive hybridization between <em>Siniperca</em> species in the future.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Organic matter reduction using four densities of seaweed (Gracilaria verucosa) and green mussel (Perna viridis) to improve water quality for aquaculture in Java, Indonesia","authors":"Lestari L. Widowati ,&nbsp;S. Budi Prayitno ,&nbsp;Sri Rejeki ,&nbsp;Tita Elfitasari ,&nbsp;Pujiono W. Purnomo ,&nbsp;Restiana W. Ariyati ,&nbsp;Roel H. Bosma ,&nbsp;Joel Aubin","doi":"10.1051/alr/2021002","DOIUrl":"10.1051/alr/2021002","url":null,"abstract":"<div><div>The high organic waste content of river water in Demak, north coast of Java, has caused traditional small-scale pond farmers to stop stocking shrimp. This paper examines whether seaweed and mussel will improve the quality of water these farmers use. The effect of <em>Gracilaria verucosa</em> and <em>Perna viridis</em> on the water quality was assessed by measuring the removal rates (RRs) of total organic material (TOM), total ammonia nitrogen (TAN), nitrite, and nitrate. The specific growth rates (SGRs) of seaweed and mussel were also measured. Thirty-six semi-outdoor tanks containing 800 L of brackish water and 7 cm substrate were randomly assigned to four replications of four densities of <em>G. verucosa</em>: 50 (S50), 100 (S100), 150 (S150), and 200 (S200) g m⁻², and of <em>P. viridis</em>: 60 (M60), 90 (M90), 120 (M120), and 150 (M150) g m⁻². Weekly, the TOM, TAN, nitrite, and nitrate contents were measured, seaweed and mussel weighted; RRs and SGRs were calculated at the end of the study. The effect of densities on the RRs was significant for both seaweed and mussel. <em>P. viridis</em> was more effective in reducing TOM (by 38%) than <em>G. verucosa</em> (7%); <em>G. verucosa</em> achieved higher RRs for TAN, nitrite, and nitrate. At S200, TOM and TAN decreased by 7.4% and 67%, respectively. At M90, TOM and TAN, decreased by 38% and 49%, respectively. However, nitrite increased significantly at S200 and M150. The SGR of seaweed was significantly lower at S200 than that at S150, S100, and S50. The best performing densities were S100 and M90.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of freshwater discharge from Namgang Dam on ichthyoplankton assemblage structure in Jinju Bay, Korea","authors":"Se Hun Myoung ,&nbsp;Seok Nam Kwak ,&nbsp;Jin-Koo Kim ,&nbsp;Jane E. Williamson ,&nbsp;Nicole Richoux","doi":"10.1051/alr/2021017","DOIUrl":"10.1051/alr/2021017","url":null,"abstract":"<div><div>The movement of fish eggs and larvae in bay and estuarine systems is affected by freshwater discharge. In this study, the assemblage structures of ichthyoplankton eggs and larvae were assessed for the first time in Jinju Bay, South Korea, to identify the spawning and nursery functions of the bay. Fish eggs and larvae and several environmental parameters were sampled monthly from April 2015 to March 2016 inside and outside of the bay. Within the bay we collected eggs and larvae from 25 and 35 species, respectively, indicating greater diversity than outside the bay, where we collected eggs and larvae of 20 and 28 species, respectively. Fluctuations in water temperature and salinity were larger inside than outside of the bay, and chlorophyll-<em>a</em> concentration was higher within the bay, likely due to discharge from the Namgang Dam, which causes water to flow from the inside to the outside of the bay. This process influences fish larva abundance, such that more larvae are found outside than inside the bay. We also found that 28 fish species use Jinju Bay as a spawning ground. For some species, the timing of egg and larva appearance differed inside and outside of the bay, suggesting that the timing of spawning may differ between the two environments.</div></div>","PeriodicalId":55491,"journal":{"name":"Aquatic Living Resources","volume":"34 ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2021-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57824440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}