Pub Date : 2018-08-13DOI: 10.15578/IFRJ.24.1.2018.25-36
Meuthia Aula Jabbar, M. Kamal, M. Boer, A. Suman, I. N. Suyasa
The reference point of reproductive biology play an important roles in developing a baseline information for fishery management. Different waters will provide different overview of fisheries related to its biological aspects. The red bigeye (Priacanthus macracanthus) is one of economically important demersal fish species in Indonesia. To support the biological status of this species, a regular field observation were carried out during May 2016 to April 2017 in Palabuhanratu bay, south of West Java. The objective of this study is to estimate the spawning season and potential reproductive stages including to evaluate how the key management related to the species and its gear selectivity. Numbers of red bigeye (Priacanthus macracanthus) specimen was collected from bottom gillnetter and hand liner. Basic information related to length-weigth, bio-reproduction (maturity) were collected regularly to determine GSI, Fecundity and its impact of fishing (Lc, Lm) to evaluate the recent stock status. The result showed sex ratio no significant differences between males and females except in September to December. The growth pattern indicated negative allometric. The predicted of spawning seasons were around June-July and December-January. Mean of fecundity was estimated to be 230,000 ± 178,000 eggs. Management keys were obtained i.e. length at first maturity (Lm) value was to be 21.9 cm TL which is smaller than length at first capture (Lc) 22.4 cm TL for bottom gill netter and 23.1 cm TL for average fishes caught by hand liner. Therefore it is recommended to close the waters in the bay area during the spawning period. In the case of catch, it is important to apply the precautionary approach with emphasizes to the size of fish allowed to be captured more than the Lm value (above 21.9 cm TL).
生殖生物学的参考点在开发渔业管理的基线信息方面发挥着重要作用。不同的水域将提供与其生物方面有关的不同的渔业概览。红大眼鱼（Priacanthus macracanths）是印度尼西亚经济上重要的底层鱼类之一。为了支持该物种的生物学状况，于2016年5月至2017年4月在西爪哇南部的Palabuhanratu湾进行了定期实地观察。本研究的目的是估计产卵季节和潜在的繁殖阶段，包括评估关键管理与物种及其渔具选择性的关系。红大眼虫（Priacanthus macracanthus）标本的数量是从刺网和手衬中采集的。定期收集与身长、生物繁殖（成熟度）相关的基本信息，以确定GSI、雌性及其对捕捞的影响（Lc、Lm），从而评估最近的种群状况。结果表明，除9月至12月外，男女性别比无显著差异。生长模式显示负异速生长。预计产卵季节在6月至7月和12月至1月左右。平均产卵量估计为230000±178000枚。获得了管理关键，即首次成熟时的长度（Lm）值为21.9 cm TL，小于首次捕获时的长度。底刺网鱼为22.4 cm TL，手动班轮捕获的普通鱼为23.1 cm TL。因此，建议在产卵期关闭湾区水域。在捕获的情况下，重要的是应用预防方法，强调允许捕获的鱼的大小超过Lm值（21.9 cm TL以上）。
{"title":"REPRODUCTIVE BIOLOGY OF THE RED BIGEYE (Priacanthus macracanthus Cuvier, 1829) IN PALABUHANRATU BAY, INDONESIA","authors":"Meuthia Aula Jabbar, M. Kamal, M. Boer, A. Suman, I. N. Suyasa","doi":"10.15578/IFRJ.24.1.2018.25-36","DOIUrl":"https://doi.org/10.15578/IFRJ.24.1.2018.25-36","url":null,"abstract":"The reference point of reproductive biology play an important roles in developing a baseline information for fishery management. Different waters will provide different overview of fisheries related to its biological aspects. The red bigeye (Priacanthus macracanthus) is one of economically important demersal fish species in Indonesia. To support the biological status of this species, a regular field observation were carried out during May 2016 to April 2017 in Palabuhanratu bay, south of West Java. The objective of this study is to estimate the spawning season and potential reproductive stages including to evaluate how the key management related to the species and its gear selectivity. Numbers of red bigeye (Priacanthus macracanthus) specimen was collected from bottom gillnetter and hand liner. Basic information related to length-weigth, bio-reproduction (maturity) were collected regularly to determine GSI, Fecundity and its impact of fishing (Lc, Lm) to evaluate the recent stock status. The result showed sex ratio no significant differences between males and females except in September to December. The growth pattern indicated negative allometric. The predicted of spawning seasons were around June-July and December-January. Mean of fecundity was estimated to be 230,000 ± 178,000 eggs. Management keys were obtained i.e. length at first maturity (Lm) value was to be 21.9 cm TL which is smaller than length at first capture (Lc) 22.4 cm TL for bottom gill netter and 23.1 cm TL for average fishes caught by hand liner. Therefore it is recommended to close the waters in the bay area during the spawning period. In the case of catch, it is important to apply the precautionary approach with emphasizes to the size of fish allowed to be captured more than the Lm value (above 21.9 cm TL). ","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43416499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-02-12DOI: 10.15578/IFRJ.23.2.2017.97-105
M. Natsir, A. Widodo, Wudianto Wudianto, S. Agnarsson
Kendari fishing port is one of the biggest tuna fisheries landing in Indonesia. It yearly average tuna production was more than 20 thousand tons. The tuna fishing fleet in Kendari use FAD (Fish Aggregating Devices) as an auxiliary fishing gear. FAD management is major issues in Indonesian tuna fisheries. extensive investment on FAD has led to increase of the juvenile and by catch and also social problem because of the competition. Technical efficiency analysis was done during this study, 2015 catch and logistic data from Kendari fishing port was run using stochastic frontier to obtain the model. Mean value technical efficiency was 0.534. Purse seine the highest mean value compared to other fishing gear. All the variables input show positive relationship to the catch except the days at sea variables, this is a signal that the increasing number of FAD has made the fisherman spend more time at sea it will decrease the technical efficiency. The results support the need of FAD regulation done by the government of Indonesia. Regulation will keep the number of FAD at optimum level and increase the technical effieciency so the fisheries keep gaining the optimum benefit from the resources.
{"title":"TECHNICAL EFICIENCY OF FISH AGGREGATING DEVICES ASSOCIATED WITH TUNA FISHERY IN KENDARI FISHING PORT – INDONESIA","authors":"M. Natsir, A. Widodo, Wudianto Wudianto, S. Agnarsson","doi":"10.15578/IFRJ.23.2.2017.97-105","DOIUrl":"https://doi.org/10.15578/IFRJ.23.2.2017.97-105","url":null,"abstract":"Kendari fishing port is one of the biggest tuna fisheries landing in Indonesia. It yearly average tuna production was more than 20 thousand tons. The tuna fishing fleet in Kendari use FAD (Fish Aggregating Devices) as an auxiliary fishing gear. FAD management is major issues in Indonesian tuna fisheries. extensive investment on FAD has led to increase of the juvenile and by catch and also social problem because of the competition. Technical efficiency analysis was done during this study, 2015 catch and logistic data from Kendari fishing port was run using stochastic frontier to obtain the model. Mean value technical efficiency was 0.534. Purse seine the highest mean value compared to other fishing gear. All the variables input show positive relationship to the catch except the days at sea variables, this is a signal that the increasing number of FAD has made the fisherman spend more time at sea it will decrease the technical efficiency. The results support the need of FAD regulation done by the government of Indonesia. Regulation will keep the number of FAD at optimum level and increase the technical effieciency so the fisheries keep gaining the optimum benefit from the resources.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"23 1","pages":"97-105"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49595659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-02-12DOI: 10.15578/IFRJ.23.2.2017.107-115
R. Faizah, L. Sadiyah, M. Fauzi
Kwandang waters is one of the main base for small pelagic fisheries in Sulawesi sea in which the Indian mackerel (Rastrelliger kanagurta) has been exploited. The objective of the research was to estimate the population parameters, exploitation rate and reproductive biology of Indian mackerel. Length frequency data were collected from PP Kwandang, between February and October 2012. Estimation of population parameters of Indian mackerel was done using FISAT II method. The results showed that growth rate as follows (K) = 0,80 year -1 , L∞=27,3 cm. Total mortality rate (Z) = 2,72 year -1 , with natural mortality (M) = 1,29 year -1 and fishing mortality (F) = 1,43 year -1 and exploitation rate (E)=0,53. Exploitation of Indian mackerel in Kwandang waters have reached its optimum level. The sex ratio of Indian mackerel was balance. The most commonly found is Gonado Maturity Stage of I. Based on the results, it is necessary to manage with the responsible management through gradually increasing of the mesh size of the gears or restricting additional lift net or by restricting fishing for certain seasons or declaring fish sanctuaries in certain areas, especially in spawning grounds to protect the Indian mackerel.
{"title":"POPULATION PARAMETER AND REPRODUCTIVE BIOLOGY OF INDIAN MACKEREL Rastrelliger kanagurta (Cuvier, 1817) CAUGHT BY LIFT NET IN KWANDANG WATERS, NORTH GORONTALO","authors":"R. Faizah, L. Sadiyah, M. Fauzi","doi":"10.15578/IFRJ.23.2.2017.107-115","DOIUrl":"https://doi.org/10.15578/IFRJ.23.2.2017.107-115","url":null,"abstract":"Kwandang waters is one of the main base for small pelagic fisheries in Sulawesi sea in which the Indian mackerel (Rastrelliger kanagurta) has been exploited. The objective of the research was to estimate the population parameters, exploitation rate and reproductive biology of Indian mackerel. Length frequency data were collected from PP Kwandang, between February and October 2012. Estimation of population parameters of Indian mackerel was done using FISAT II method. The results showed that growth rate as follows (K) = 0,80 year -1 , L∞=27,3 cm. Total mortality rate (Z) = 2,72 year -1 , with natural mortality (M) = 1,29 year -1 and fishing mortality (F) = 1,43 year -1 and exploitation rate (E)=0,53. Exploitation of Indian mackerel in Kwandang waters have reached its optimum level. The sex ratio of Indian mackerel was balance. The most commonly found is Gonado Maturity Stage of I. Based on the results, it is necessary to manage with the responsible management through gradually increasing of the mesh size of the gears or restricting additional lift net or by restricting fishing for certain seasons or declaring fish sanctuaries in certain areas, especially in spawning grounds to protect the Indian mackerel.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"256 1","pages":"107-115"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41274473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-02-12DOI: 10.15578/IFRJ.23.2.2017.69-78
H. Irianto, S. Hartati, L. Sadiyah
The Great Jakarta Bay Ecosystem (GJBE) supports the economic growth for the surrounding community, including fisheries sector. This large ecosystem is consisted of two coastal ecosystems, i.e. Jakarta Bay and Thousands islands. There are only traditional fisheries operating either in Jakarta Bay or Thousand islands. Some economically important fisheries include shrimp, demersal and small pelagic fisheries, which are caught using different fishing gears, either active or passive fishing gears. There are some serious concerns related to the fish resources and habitat degradations in the GJBE, which in turn can cause the decrease in fish population and fish species diversity, respectively. CPUE and catch composition of the fixed lift nets, sero and fixed gillnet fisheries were obtained from the observations in 2006 and 2014. In addition, to determine the level of pollution, tissue samples were collected for green mussel (Perna viridis), blue swimming crab (Portunus pelagicus) and white-spotted spinefoot (Siganus canaliculatus) in 2009. The CPUE trend and catch composition showed that overfishing might have been occurring in the Jakarta Bay. The histological study on gill tissues of the three species shows that the Jakarta Bay has been polluted. Several efforts have been done to address the problems, including sea farming, habitat rehabilitation (artificial reef and mangrove restoration), marine conservation area and fish shelter, restocking and sea ranching.
{"title":"FISHERIES AND ENVIRONMENTAL IMPACTS IN THE GREAT JAKARTA BAY ECOSYSTEM","authors":"H. Irianto, S. Hartati, L. Sadiyah","doi":"10.15578/IFRJ.23.2.2017.69-78","DOIUrl":"https://doi.org/10.15578/IFRJ.23.2.2017.69-78","url":null,"abstract":"The Great Jakarta Bay Ecosystem (GJBE) supports the economic growth for the surrounding community, including fisheries sector. This large ecosystem is consisted of two coastal ecosystems, i.e. Jakarta Bay and Thousands islands. There are only traditional fisheries operating either in Jakarta Bay or Thousand islands. Some economically important fisheries include shrimp, demersal and small pelagic fisheries, which are caught using different fishing gears, either active or passive fishing gears. There are some serious concerns related to the fish resources and habitat degradations in the GJBE, which in turn can cause the decrease in fish population and fish species diversity, respectively. CPUE and catch composition of the fixed lift nets, sero and fixed gillnet fisheries were obtained from the observations in 2006 and 2014. In addition, to determine the level of pollution, tissue samples were collected for green mussel (Perna viridis), blue swimming crab (Portunus pelagicus) and white-spotted spinefoot (Siganus canaliculatus) in 2009. The CPUE trend and catch composition showed that overfishing might have been occurring in the Jakarta Bay. The histological study on gill tissues of the three species shows that the Jakarta Bay has been polluted. Several efforts have been done to address the problems, including sea farming, habitat rehabilitation (artificial reef and mangrove restoration), marine conservation area and fish shelter, restocking and sea ranching.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"23 1","pages":"69-78"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48670735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-02-12DOI: 10.15578/IFRJ.23.2.2017.55-67
M. Mujiyanto, Riswanto Riswanto, Dharmadi Dharmadi, W. Ghiffary
Dolphins are one of the most interesting cetacean types included in family Delphinidae or known as the oceanic dolphins from genus Stenella sp. and Tursiops sp. Migration and abundance of dolphins are affected by the presence of food and oceanographic conditions. The purpose of this research is to determine the composition and distribution of dolphins in relation to the water quality parameters. Benefits of this research are expected to provide information on the relationship between distributions of the family Delphinidae cetacean (oceanic dolphins) and oceanographic conditions. The method for this research is descriptive exploratory, with models onboard tracking survey. Field observations were done in November 2015 and period of March-April 2016 outside and inside Savu Sea National Marine Park waters. The sighting of dolphin in November and March-April found as much seven species: bottlenose dolphin, fraser’s dolphin, pantropical spotted dolphin, risso’s dolphin, rough-toothed dolphin, spinner dolphin and stripped dolphin. The highest species distribution noted in the Savu Sea is spinner dolphin, pantropical spotted dolphin, rough-toothed dolphin and frazer’s dolphin. The existence of dolphins in Savu Sea is more related with sea surface temperature than others oceanographic parameters. This condition is suspected due to the influence of sea surface temperature to body temperature of dolphin especially for foraging activities. The habit of dolphin is more active around Sumba Island and Daratan Timor waters while in the evening the animal is usually going to Manggarai and Rote Ndao Islands waters to rest.
{"title":"COMPOSITION AND DISTRIBUTION OF DOLPHIN IN SAVU SEA NATIONAL MARINE PARK, EAST NUSA TENGGARA","authors":"M. Mujiyanto, Riswanto Riswanto, Dharmadi Dharmadi, W. Ghiffary","doi":"10.15578/IFRJ.23.2.2017.55-67","DOIUrl":"https://doi.org/10.15578/IFRJ.23.2.2017.55-67","url":null,"abstract":"Dolphins are one of the most interesting cetacean types included in family Delphinidae or known as the oceanic dolphins from genus Stenella sp. and Tursiops sp. Migration and abundance of dolphins are affected by the presence of food and oceanographic conditions. The purpose of this research is to determine the composition and distribution of dolphins in relation to the water quality parameters. Benefits of this research are expected to provide information on the relationship between distributions of the family Delphinidae cetacean (oceanic dolphins) and oceanographic conditions. The method for this research is descriptive exploratory, with models onboard tracking survey. Field observations were done in November 2015 and period of March-April 2016 outside and inside Savu Sea National Marine Park waters. The sighting of dolphin in November and March-April found as much seven species: bottlenose dolphin, fraser’s dolphin, pantropical spotted dolphin, risso’s dolphin, rough-toothed dolphin, spinner dolphin and stripped dolphin. The highest species distribution noted in the Savu Sea is spinner dolphin, pantropical spotted dolphin, rough-toothed dolphin and frazer’s dolphin. The existence of dolphins in Savu Sea is more related with sea surface temperature than others oceanographic parameters. This condition is suspected due to the influence of sea surface temperature to body temperature of dolphin especially for foraging activities. The habit of dolphin is more active around Sumba Island and Daratan Timor waters while in the evening the animal is usually going to Manggarai and Rote Ndao Islands waters to rest.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"23 1","pages":"55-67"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46891325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-02-12DOI: 10.15578/IFRJ.23.2.2017.79-87
A. Priatna, S. Suprapto
Any fish on swept area of bottom trawl could not be caught due to some technical factors during towing. However, it could be estimated by integrated of bottom trawl and acoustic survey. This paper describes the determination of some factors that affect the performance of trawl net during the bottom trawl survey in the waters of Tarakan. Surveys were carried out in May, August, and November 2012. A total of 57 stations of simultaneously acoustic-trawl were completed. Data collected from each station include catch composition, and variables of trawling operation (i.e. bottom depth, warp length, trawl door opening, towing speed, towing duration, and acoustic fish density). Principal component analysis was applied to identify variables might impact of trawling performance (i.e. fish density at the waters area, towing speed, towing duration, warp length, horizontal opening of trawl door, density of non-demersal at cod end, and bottom depth). Both towing speed and towing duration were not major component for trawl operation. According to test of significance for four variables (i.e. bottom depth, warp length, horizontal opening, biota non-demersal at cod end) which affected to fish density at waters area, that both of variable (i.e. warp length and bottom depth) were significant as the principal components for the performance of bottom trawl.
{"title":"FACTORS INFLUENCING THE PERFORMANCE OF TRAWL OPERATION IN THE WATERS AREA OF TARAKAN","authors":"A. Priatna, S. Suprapto","doi":"10.15578/IFRJ.23.2.2017.79-87","DOIUrl":"https://doi.org/10.15578/IFRJ.23.2.2017.79-87","url":null,"abstract":"Any fish on swept area of bottom trawl could not be caught due to some technical factors during towing. However, it could be estimated by integrated of bottom trawl and acoustic survey. This paper describes the determination of some factors that affect the performance of trawl net during the bottom trawl survey in the waters of Tarakan. Surveys were carried out in May, August, and November 2012. A total of 57 stations of simultaneously acoustic-trawl were completed. Data collected from each station include catch composition, and variables of trawling operation (i.e. bottom depth, warp length, trawl door opening, towing speed, towing duration, and acoustic fish density). Principal component analysis was applied to identify variables might impact of trawling performance (i.e. fish density at the waters area, towing speed, towing duration, warp length, horizontal opening of trawl door, density of non-demersal at cod end, and bottom depth). Both towing speed and towing duration were not major component for trawl operation. According to test of significance for four variables (i.e. bottom depth, warp length, horizontal opening, biota non-demersal at cod end) which affected to fish density at waters area, that both of variable (i.e. warp length and bottom depth) were significant as the principal components for the performance of bottom trawl.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"23 1","pages":"79-87"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41557344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-02-12DOI: 10.15578/ifrj.23.2.2017.89-96
A. Zamroni, Suwarso Suwarso
Mackerel scads (Decapterus macarellus) is a small widely distributed pelagic species in ocean. In 2013, monthly catch and abundance index of mackerel scads increased in western part of Sumatera waters. High exploitation of mackerel scads may lead to decrease stock due to the over exploitation. Stock information is very useful for calculating of the potential fish. Genetic analysis is one of the powerful tools to estimate fish stock quickly. Genetic diversity of mackerel scads in this study was analyzed using RFLP (Restriction Fragment Length Polymorphism) with AfaI, EcoR I, HapII, HinfI and TaqI restriction enzyme. The results showed that the lowest genetic diversity of mackerel scads was Labuan population. Kinship Labuan was also the furtherest stock compared to other populations. It can be concluded that the population of Labuan is derived from a different sub-species. The closest kinship was between Aceh and Sibolga stock.
Mackerel scads是一种分布广泛的小型远洋物种。2013年，苏门答腊岛西部海域的每月捕获量和鲭鱼数量指数有所增加。由于过度开发，大量开发的鲭鱼可能会导致种群减少。种群信息对于计算潜在鱼类非常有用。基因分析是快速估计鱼类种群的有力工具之一。本研究采用RFLP（Restriction Fragment Length Polymorphism，限制性片段长度多态性）与AfaI、EcoR I、HapII、HinfI和TaqI限制性内切酶进行了遗传多样性分析。结果表明，纳闽群体是我国竹荚鱼遗传多样性最低的群体。与其他种群相比，近亲纳闽也是最远的种群。可以得出结论，纳闽种群来源于不同的亚种。最接近的亲缘关系是亚齐和锡博尔加种群之间的亲缘关系。
{"title":"GENETIC DIVERSITY OF MACKEREL SCADS, Decapterus macarellus (Cuvier, 1833) IN THE INDIAN OCEAN","authors":"A. Zamroni, Suwarso Suwarso","doi":"10.15578/ifrj.23.2.2017.89-96","DOIUrl":"https://doi.org/10.15578/ifrj.23.2.2017.89-96","url":null,"abstract":"Mackerel scads (Decapterus macarellus) is a small widely distributed pelagic species in ocean. In 2013, monthly catch and abundance index of mackerel scads increased in western part of Sumatera waters. High exploitation of mackerel scads may lead to decrease stock due to the over exploitation. Stock information is very useful for calculating of the potential fish. Genetic analysis is one of the powerful tools to estimate fish stock quickly. Genetic diversity of mackerel scads in this study was analyzed using RFLP (Restriction Fragment Length Polymorphism) with AfaI, EcoR I, HapII, HinfI and TaqI restriction enzyme. The results showed that the lowest genetic diversity of mackerel scads was Labuan population. Kinship Labuan was also the furtherest stock compared to other populations. It can be concluded that the population of Labuan is derived from a different sub-species. The closest kinship was between Aceh and Sibolga stock.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"23 1","pages":"89-96"},"PeriodicalIF":0.0,"publicationDate":"2018-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46743743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-10-17DOI: 10.15578/IFRJ.23.1.2017.1-6
B. Setyadji, I. Jatmiko
Indonesian tuna longline fleets have been fishing in the Exclusive Economic Zone (EEZ) and high seas of the Indian Ocean for quite some time. However, effort has never been made to separate catch from the EEZ and the high seas as it important for fisheries management. A total of 2,430 set-by-set longline fishing data had been collected by scientific observers based in the Research Institute of Tuna Fishery in Bali since August 2005 to December 2014 on which present analysis was made. The research aims to compare between trend of tuna catch of the EEZ and of the high seas of Indian Ocean. The results show that the mean hook rate of both catches of big eye tuna (BET) and southern Bluefin tuna (SBT) caught in the high seas was significantly higher than that the EEZ (two sample t-test, p 0.05).
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Pub Date : 2017-10-17DOI: 10.15578/IFRJ.23.1.2017.23-28
P. Lestari, R. Lester, C. Proctor
Tuna fish are highly migratory species. Clarifying their stock structures and migration patterns is important for tuna fisheries management. The purpose of this research was to examine the parasites of bigeye tuna (Thunnus obesus) and yellowfin tuna (Thunnus albacares) to determine which parasites may be potential stock markers for assessment of tuna migration patterns. Bigeye tuna and yellowfin tuna were collected (measured between 28-48 cm fork length) from 9 sites across Indonesia and from 2 ‘outlier sites’ (The Maldives and Solomon Islands). Organs including gills (filaments and branchial arches), stomach wall, liver, pyloric caeca, and intestines were examined. Seven types of didymozoids were distinguished including 3 Didymosulcus spp., 4 Kollikeria spp. and one acanthocephalan (Bolbosoma sp.). The results suggest these fish parasites are potentially useful markers for assessment of tuna migration pattern, contributing information needed for fisheries management in Indonesia.
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Pub Date : 2017-10-17DOI: 10.15578/ifrj.23.1.2017.29-38
F. Rochman, B. Setyadji, A. Wujdi
Albacore (Thunnus alalunga) is the third dominant catch of Indonesian tuna longline fishery operating in the eastern Indian Ocean. The percentage production of albacore catch was reaching up 6% of the total catch of tuna groups in Indonesia. Thi study aims to examine a relative abundance indices using standardized catch per unit of effort (CPUE) of longliner based on albacore tuna. This information will give a valuable input and information to support stock assessment particularly in the regional basis. In this study, we use Generalized Linear Model (GLM) with Tweedie distribution to standardize the CPUE and to estimate relative abundance indices based on the Indonesian longline dataset time series. Data were collected from January 2006 to October 2015 (106 trip observer and 8.989 fishing days) by conducting direct onboard observation on tuna longline vessels operating in the Indian Ocean. The result show that year, area,hooks between floats, year*season, year*area and year* hooks between floats significantly influenced the nominal CPUE of albacore. The highest value of Standardized CPUE appeared in 2014 and probably related to the large number of foreign fishing vessels with a high capacity (over 60 GT) targeting frozen tuna including albacore. In 2015, standardized CPUE value was sharply decreased due to the ban of foreign vessels in Indonesia.
长鳍金枪鱼(Thunnus alalunga)是印度尼西亚东印度洋延绳钓金枪鱼渔业的第三大主要渔获物。长鳍金枪鱼的渔获量占印度尼西亚金枪鱼总渔获量的比例达到6%。本研究旨在利用长鳍金枪鱼的标准化单位努力捕获量(CPUE)来检验相对丰度指数。这些资料将提供宝贵的投入和资料，以支持特别是在区域基础上的种群评估。本研究基于印尼延绳钓数据时间序列，采用具有Tweedie分布的广义线性模型(Generalized Linear Model, GLM)对CPUE进行标准化，并估算相对丰度指数。数据收集时间为2006年1月至2015年10月(106个行程观察员和8.989个渔日)，通过对印度洋金枪鱼延绳钓渔船进行直接船上观测。结果表明，年、面积、鱼竿间钩、年*季节、年*面积和鱼竿间钩对长鳍金枪鱼的名义CPUE有显著影响。标准化CPUE最大值出现在2014年，可能与大量高容量(60 GT以上)的外国渔船捕捞包括长鳍金枪鱼在内的冷冻金枪鱼有关。2015年，由于印尼禁止外国船只进入，标准化CPUE值急剧下降。
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