Pub Date : 2021-12-25DOI: 10.15578/ifrj.27.2.2021.109-116
Ragil Pinasti, Warisatul Ilmi, Tuty Ari Suryani
Indonesia is one of the countries with high biodiversity of freshwater fishes. One freshwater fish with a wide distribution in Asia with high economic potency for ornamental fish is dwarf snakehead. However, research on genetic characterization of dwarf snakehead from Indonesia is very limited. Therefore, this research aimed to compare genetic characterization of the dwarf snakehead from rice field irrigation at Donomulyo Village (Malang, East Java) and from Keji River (Magelang, Central Java). This study used a PCR method with universal primers: 16Sar and 16Sbr. The data obtained in this study were then analyzed using DNASTAR, BLAST, Mesquite, MEGA, DnaSP, and NETWORK. The results revealed the genetic distance between dwarf snakehead from rice field irrigation at Donomulyo Village and from Keji River was 1.36%. The divergence of GC content, haplotype number, variables sites, haplotype diversity, and nucleotide diversity in both populations exist. The results of this study are expected to arrange 16S mitochondrial DNA Library of dwarf snakehead from Indonesia which is useful for a reference in the conservation and utilization and management of dwarf snakehead in their habitat.
{"title":"GENETIC CHARACTERIZATION OF DWARF SNAKEHEAD, Channa gachua (Hamilton, 1822), FROM TWO POPULATIONS BASED ON 16S rRNA GENE","authors":"Ragil Pinasti, Warisatul Ilmi, Tuty Ari Suryani","doi":"10.15578/ifrj.27.2.2021.109-116","DOIUrl":"https://doi.org/10.15578/ifrj.27.2.2021.109-116","url":null,"abstract":"Indonesia is one of the countries with high biodiversity of freshwater fishes. One freshwater fish with a wide distribution in Asia with high economic potency for ornamental fish is dwarf snakehead. However, research on genetic characterization of dwarf snakehead from Indonesia is very limited. Therefore, this research aimed to compare genetic characterization of the dwarf snakehead from rice field irrigation at Donomulyo Village (Malang, East Java) and from Keji River (Magelang, Central Java). This study used a PCR method with universal primers: 16Sar and 16Sbr. The data obtained in this study were then analyzed using DNASTAR, BLAST, Mesquite, MEGA, DnaSP, and NETWORK. The results revealed the genetic distance between dwarf snakehead from rice field irrigation at Donomulyo Village and from Keji River was 1.36%. The divergence of GC content, haplotype number, variables sites, haplotype diversity, and nucleotide diversity in both populations exist. The results of this study are expected to arrange 16S mitochondrial DNA Library of dwarf snakehead from Indonesia which is useful for a reference in the conservation and utilization and management of dwarf snakehead in their habitat.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48001521","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 : 2021-06-22DOI: 10.15578/IFRJ.27.1.2021.9-15
M. Irham, Fitri Handayani, R. M. Aprilla, A. Deli
Increasing the amount of by-catch has become one of the causes of the decline in fish stocks that can threaten the sustainability of world fisheries. It may occur in small local brackish-water fisheries, especially in one of the tidal canals of North Aceh, i.e., Krueng Jambo Aye. Therefore, the investigation composition of the main catch and by-catch in a tidal channel of Krueng Jambo Aye is an essential indicator to describe the ecosystem impact by these fisheries. This study aims to determine the comparison of the composition of the main catches and by-catches, to determine the types of by-catches, and to identify the catch rate. The method used in this study is a field data collection and survey methods. The data analysis used was a capture rate analysis. The results showed that the main catches are more dominated by 72% while the by-catch by 28%. There are five species of by-catch with high economic value and nine species with low commercial value. The catch rate of the two catches are 0.42 kg per hour for the main catch and 0.16 kg per hour for the by-catch. It is expected that the results of this study can be used as necessary information to develop the fisheries improvement program in this area.
{"title":"CATCH COMPOSITION OF AMBAI NET IN KRUENG JAMBO AYE TIDAL CANAL FISHERIES, NORTH ACEH – INDONESIA","authors":"M. Irham, Fitri Handayani, R. M. Aprilla, A. Deli","doi":"10.15578/IFRJ.27.1.2021.9-15","DOIUrl":"https://doi.org/10.15578/IFRJ.27.1.2021.9-15","url":null,"abstract":"Increasing the amount of by-catch has become one of the causes of the decline in fish stocks that can threaten the sustainability of world fisheries. It may occur in small local brackish-water fisheries, especially in one of the tidal canals of North Aceh, i.e., Krueng Jambo Aye. Therefore, the investigation composition of the main catch and by-catch in a tidal channel of Krueng Jambo Aye is an essential indicator to describe the ecosystem impact by these fisheries. This study aims to determine the comparison of the composition of the main catches and by-catches, to determine the types of by-catches, and to identify the catch rate. The method used in this study is a field data collection and survey methods. The data analysis used was a capture rate analysis. The results showed that the main catches are more dominated by 72% while the by-catch by 28%. There are five species of by-catch with high economic value and nine species with low commercial value. The catch rate of the two catches are 0.42 kg per hour for the main catch and 0.16 kg per hour for the by-catch. It is expected that the results of this study can be used as necessary information to develop the fisheries improvement program in this area.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"27 1","pages":"9-15"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43721496","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 : 2021-06-16DOI: 10.15578/IFRJ.27.1.2021.27-36
Tirtadanu Tirtadanu, U. Chodrijah, K. Wagiyo
The important information that was needed for determining the sustainable management of mud spiny lobster ( Panulirus polyphagus Herbst, 1793) in Sebatik Waters were the exploitation status and the reference point. The aims of this research was to study the reference point and the exploitation status of P. polyphagus . This research was conducted from March 2016 to December 2018 and the total samples of 1.261 female lobsters had been collected monthly from the traditional gillnet fishers in Sebatik. Reference point was determined from the Beverton and Holt yield per recruit and the exploitation status was estimated from the length based spawning potential ratio (LB-SPR). The results showed that a lot of P. polyphagus catched by the gillnets were still immature. The annual spawning potential ratios from 2016 to 2018 were still lower than the reference point of 24% that showed the overexploited status of P. polyphagus in Sebatik Waters. The minimum legal size of 87 mmCL or the minimum weights of 500 grams and not increasing the quota vessels following by the monitoring study of its stock for the next several years were some recommendations for the sustainable P. polyphagus management in Sebatik Waters.
{"title":"REFERENCE POINT AND EXPLOITATION STATUS OF MUD SPINY LOBSTER (Panulirus polyphagus Herbst, 1793) IN SEBATIK WATERS, INDONESIA","authors":"Tirtadanu Tirtadanu, U. Chodrijah, K. Wagiyo","doi":"10.15578/IFRJ.27.1.2021.27-36","DOIUrl":"https://doi.org/10.15578/IFRJ.27.1.2021.27-36","url":null,"abstract":"The important information that was needed for determining the sustainable management of mud spiny lobster ( Panulirus polyphagus Herbst, 1793) in Sebatik Waters were the exploitation status and the reference point. The aims of this research was to study the reference point and the exploitation status of P. polyphagus . This research was conducted from March 2016 to December 2018 and the total samples of 1.261 female lobsters had been collected monthly from the traditional gillnet fishers in Sebatik. Reference point was determined from the Beverton and Holt yield per recruit and the exploitation status was estimated from the length based spawning potential ratio (LB-SPR). The results showed that a lot of P. polyphagus catched by the gillnets were still immature. The annual spawning potential ratios from 2016 to 2018 were still lower than the reference point of 24% that showed the overexploited status of P. polyphagus in Sebatik Waters. The minimum legal size of 87 mmCL or the minimum weights of 500 grams and not increasing the quota vessels following by the monitoring study of its stock for the next several years were some recommendations for the sustainable P. polyphagus management in Sebatik Waters.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"27 1","pages":"27-36"},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43494491","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 : 2021-06-16DOI: 10.15578/IFRJ.27.1.2021.1-8
R. Gustiano, Muhammad Hunaina Fariduddin Ath-thar, D. Radona, S. Sundari, I. I. Kusmini
Sheat catfishes is an economically important species group from open water in Indonesia. As a high demand in the local market, this species group was threatened from overfishing and habitat destruction. For its sustainability, sheat catfishes should have an attention to be conserved and domesticated. Population genetic study has been done to understand the diversity of sheat catfishes as the basic information for its aquaculture program. Objectives of the current study are to identify and characterize the phenotype and genotype of sheat catfishes population at Plaju, Mariana Ulu, Mariana Ilir and Meritai in the down stream of Musi River, South Sumatra Province. Phenotypic analysis based on truss morphometric used eight land-mark on the body of the observed specimens. Ten specimens from each site varying in size were measured with dial caliper with an accuracy of 0.01 mm. Meanwhile, the genetic analysis used PCR-RAPD method using OPA 06, OPA 08, and OPA 12 primers. DNA was extracted from the fin of the observed specimens. Discriminant analysis reflecting in the canonical function of truss morphometric data showed that six morphometric characters (A1, A2, A5, B2, B4, and C4) enabled to separate sheat catfishes population. The population of Mariana Ulu and Mariana Ilir spread on negative of Y axis, separately from population of Plaju and Meritai. The population of Meritai is on negative of the X axis. Genetic analyses found that the population of Mariana Ilir and Meritai have a percentage polymorphism of 22.00% which was higher than the population from Mariana Ulu and Plaju with a percentage of 18%. The population of Mariana Ilir has the highest heterozygosis value of 0.093. Kinship analysis showed that the population from Plaju and Mariana Ilir has the closest distance (0.3463) while the population of Meritai and Plaju has the farthest distance (0.5429).
{"title":"PRELIMINARY STUDY ON THE MORPHOMETRIC AND GENETIC OF SHEAT CATFISHES POPULATION (SILURIDAE) FROM THE DOWN STREAM OF MUSI RIVER, SOUTH SUMATRA PROVINCE, INDONESIA","authors":"R. Gustiano, Muhammad Hunaina Fariduddin Ath-thar, D. Radona, S. Sundari, I. I. Kusmini","doi":"10.15578/IFRJ.27.1.2021.1-8","DOIUrl":"https://doi.org/10.15578/IFRJ.27.1.2021.1-8","url":null,"abstract":"Sheat catfishes is an economically important species group from open water in Indonesia. As a high demand in the local market, this species group was threatened from overfishing and habitat destruction. For its sustainability, sheat catfishes should have an attention to be conserved and domesticated. Population genetic study has been done to understand the diversity of sheat catfishes as the basic information for its aquaculture program. Objectives of the current study are to identify and characterize the phenotype and genotype of sheat catfishes population at Plaju, Mariana Ulu, Mariana Ilir and Meritai in the down stream of Musi River, South Sumatra Province. Phenotypic analysis based on truss morphometric used eight land-mark on the body of the observed specimens. Ten specimens from each site varying in size were measured with dial caliper with an accuracy of 0.01 mm. Meanwhile, the genetic analysis used PCR-RAPD method using OPA 06, OPA 08, and OPA 12 primers. DNA was extracted from the fin of the observed specimens. Discriminant analysis reflecting in the canonical function of truss morphometric data showed that six morphometric characters (A1, A2, A5, B2, B4, and C4) enabled to separate sheat catfishes population. The population of Mariana Ulu and Mariana Ilir spread on negative of Y axis, separately from population of Plaju and Meritai. The population of Meritai is on negative of the X axis. Genetic analyses found that the population of Mariana Ilir and Meritai have a percentage polymorphism of 22.00% which was higher than the population from Mariana Ulu and Plaju with a percentage of 18%. The population of Mariana Ilir has the highest heterozygosis value of 0.093. Kinship analysis showed that the population from Plaju and Mariana Ilir has the closest distance (0.3463) while the population of Meritai and Plaju has the farthest distance (0.5429).","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"27 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47784183","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 : 2021-06-16DOI: 10.15578/IFRJ.27.1.2021.51-60
L. P. Dewanti, H. Siry, Alexander M. A. Khan
This research examines tuna pole-and-line landings data by focusing on trend and effort levels in Larantuka, Flores Timur District, Nusa Tenggara Timur Province, Indonesia. The analyzed fisheries data indicate trends that might be useful for monitoring and management purposes. The research data used were from the landings, number of trips, and fishing gear data on tuna pole-and-line from 2005 to 2014 provided by local fisheries authority. Data was also sourced from previous publications and field surveys. This research analyzes data on tuna pole-and-line fishery trends, relationships between landings, number of trips, and fishing gears used. Overall, the data on tuna landings from 2005-2014 increased whilst on the contrary there was a decrease in the numbers of trips and fishing gears used. The relationship between landings to trips (slope = -0.0087; p-value = 0.7639) and gears (slope = 8.1285; p-value = 0.2715) can be interpreted as being a unit increase in number of trips, which tended to be linked with a decrease of 0.0087 tons in landings. In contrast, a unit increase in gears tended to be associated with an increase of 8.1285 tons in landings.The research did not show statistically significant relationships among landings, numbers of both trips, and fishing gears.
{"title":"A BRIEF INFORMATION ON TUNA POLE-AND-LINE LANDINGS AND FISHING EFFORTS IN LARANTUKA, FLORES TIMUR DISTRICT, NUSA TENGGARA TIMUR PROVINCE, INDONESIA","authors":"L. P. Dewanti, H. Siry, Alexander M. A. Khan","doi":"10.15578/IFRJ.27.1.2021.51-60","DOIUrl":"https://doi.org/10.15578/IFRJ.27.1.2021.51-60","url":null,"abstract":"This research examines tuna pole-and-line landings data by focusing on trend and effort levels in Larantuka, Flores Timur District, Nusa Tenggara Timur Province, Indonesia. The analyzed fisheries data indicate trends that might be useful for monitoring and management purposes. The research data used were from the landings, number of trips, and fishing gear data on tuna pole-and-line from 2005 to 2014 provided by local fisheries authority. Data was also sourced from previous publications and field surveys. This research analyzes data on tuna pole-and-line fishery trends, relationships between landings, number of trips, and fishing gears used. Overall, the data on tuna landings from 2005-2014 increased whilst on the contrary there was a decrease in the numbers of trips and fishing gears used. The relationship between landings to trips (slope = -0.0087; p-value = 0.7639) and gears (slope = 8.1285; p-value = 0.2715) can be interpreted as being a unit increase in number of trips, which tended to be linked with a decrease of 0.0087 tons in landings. In contrast, a unit increase in gears tended to be associated with an increase of 8.1285 tons in landings.The research did not show statistically significant relationships among landings, numbers of both trips, and fishing gears.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"27 1","pages":"51-60"},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46353572","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 : 2021-06-16DOI: 10.15578/IFRJ.27.1.2021.17-26
P. A. Tampubolon, N. D. Pertami, A. Wujdi
Bali Strait was one of the highest density areas for small pelagic fish in Indonesian Fisheries Management Area (FMA)-573 with goldstripe sardinella (Sardinella gibbosa) as was one of the abundant species in the catch. The aims of this study were to reveal the morphoregression characteristics and the first size of maturity for Sardinella gibbosa in Bali Strait waters. A total of 1.282 goldstripe sardinella were measured in total length (TL), fork length (FL), and standard length (SL)) and weighed during the study. All of the length measurement methods were highly related to the weight, which were W = 4 x 10-6 TL3,1686 (R² = 0,9817); W = 4 x 10-6 FL3,2334 (R² = 0,9732); and W = 1 x 10-5 SL3,0239 (R² = 0,9656), respectively. Among all the measurement methods, total length estimated the weight more accurately than the others. The growth pattern of goldstripe sardinella in this study were various based on the measurement method, sex, and the maturity level of the fish. A total of 800 individuals were dissected and their gonads examined. The sex was identified by visual characteristics. The size at 50% maturity for goldstripe sardinella in Bali Strait was 148 mm TL for male and 155 mm TL for female. Most of the caught fish were under the size at 50% maturity.
巴厘海峡是印度尼西亚渔业管理区（FMA）中小型中上层鱼类密度最高的地区之一，573，金鳞沙丁鱼（sardinella gibbosa）是渔获物中丰富的物种之一。本研究旨在揭示巴厘海峡水域长臂猿的形态回归特征和首次成熟度大小。在研究过程中，共测量了1.282条金曲沙丁鱼的总长度（TL）、叉长（FL）和标准长度（SL）并称重。所有的长度测量方法都与重量高度相关，它们是W=4x10-6 TL31686（R²=09817）；W=4 x 10-6 FL32334（R²=09732）；W=1 x 10-5 SL30239（R²=09656）。在所有的测量方法中，总长比其他测量方法更准确地估计了重量。根据测量方法、性别和成熟度的不同，本研究中的金曲沙丁鱼的生长模式各不相同。共解剖了800个个体，并检查了它们的性腺。性别由视觉特征确定。巴厘海峡金鳞沙丁鱼50%成熟度时的大小为雄性148 mm TL，雌性155 mm TL。大多数捕获的鱼在50%的成熟度时都不到这个尺寸。
{"title":"MORPHOREGRESSION AND FIRST SIZE AT MATURITY OF GOLDSTRIPE SARDINELLA (SARDINELLA GIBBOSA) FROM BALI STRAIT WATERS","authors":"P. A. Tampubolon, N. D. Pertami, A. Wujdi","doi":"10.15578/IFRJ.27.1.2021.17-26","DOIUrl":"https://doi.org/10.15578/IFRJ.27.1.2021.17-26","url":null,"abstract":"Bali Strait was one of the highest density areas for small pelagic fish in Indonesian Fisheries Management Area (FMA)-573 with goldstripe sardinella (Sardinella gibbosa) as was one of the abundant species in the catch. The aims of this study were to reveal the morphoregression characteristics and the first size of maturity for Sardinella gibbosa in Bali Strait waters. A total of 1.282 goldstripe sardinella were measured in total length (TL), fork length (FL), and standard length (SL)) and weighed during the study. All of the length measurement methods were highly related to the weight, which were W = 4 x 10-6 TL3,1686 (R² = 0,9817); W = 4 x 10-6 FL3,2334 (R² = 0,9732); and W = 1 x 10-5 SL3,0239 (R² = 0,9656), respectively. Among all the measurement methods, total length estimated the weight more accurately than the others. The growth pattern of goldstripe sardinella in this study were various based on the measurement method, sex, and the maturity level of the fish. A total of 800 individuals were dissected and their gonads examined. The sex was identified by visual characteristics. The size at 50% maturity for goldstripe sardinella in Bali Strait was 148 mm TL for male and 155 mm TL for female. Most of the caught fish were under the size at 50% maturity.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"27 1","pages":"17-26"},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46644991","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 : 2021-06-10DOI: 10.15578/IFRJ.27.1.2021.37-49
Agus Setiyawan, Michael A. Rice, F. Satria, A. Widodo
Several population parameters of skipjack tuna (Katsuwonus pelamis) taken by pole and line gear from Maumere Waters from March 2017 to February 2018 were analyzed. A total of 2,194 skipjack tuna was sampled randomly. Fishing activities were carried out around FADs (Fish Aggregating Devices) and free fish shoal. Observers and enumerators collected data from several landing sites and by direct on-board observations. This study aims to provide length-frequency distribution by season, estimate growth mortality parameters, and estimate stock exploitation rate using FISAT software. The results showed that the total catch was dominated by skipjack tuna; up to 80% with the CPUE of 30.8 kg/person/trip, and the skipjack tuna’s length distribution ranged from 26 to 69 cm FL. Length at first capture (Lc) was 34.71 cm FL, and immature fish dominated the total catch with 53%, indicating growth overfishing. The calculated von Bertalanffy growth (VBG) parameters were L= 70.35 cm, K = 0.55 yr-1, and t0 = -0.39 yr. Natural mortality (M) was estimated to be 0.92 and fishing mortality (F) was 0.91. The mean longevity of skipjack tuna is estimated to be 3.2 years, with an exploitation rate (E) of 0.50. Sustainable exploitation of skipjack tuna determined from this analysis could be developed with an Emax of 0.73. There is a focus on reducing the catch of immature fish through various methods that include changing the fishing target area from FADs to fishing on natural fish schools and using gear modifications such as larger-sized (lower number) hooks.
分析了2017年3月至2018年2月在毛米尔水域用鱼竿和鱼线渔具捕获的鲣鱼种群的若干参数。随机抽取了2194条鲣鱼。渔捞活动围绕鱼群聚集装置和自由鱼群进行。观察员和计数员从若干着陆点和通过直接机载观测收集数据。本研究旨在利用FISAT软件提供不同季节的长频分布，估算生长死亡率参数，并估算种群的开采率。结果表明:总渔获量以鲣鱼为主;鱼长分布在26 ~ 69 cm FL之间，初捕长度(Lc)为34.71 cm FL，未成熟鱼占捕捞总量的53%，显示出生长过度捕捞的特征。计算的von Bertalanffy生长(VBG)参数为L= 70.35 cm, K = 0.55 year -1, t0 = -0.39 yr。估计自然死亡率(M)为0.92，捕捞死亡率(F)为0.91。鲣鱼的平均寿命估计为3.2年，捕捞率(E)为0.50。该分析确定的鲣鱼可持续开发的Emax值为0.73。目前的重点是通过各种方法减少未成熟鱼类的捕捞，包括将捕捞目标区域从FADs改为在天然鱼群上捕捞，并使用诸如更大尺寸(数量更少)的鱼钩等改装渔具。
{"title":"ESTIMATES OF LENGTH-BASED POPULATION PARAMETERS OF SKIPJACK TUNA (KATSUWONUS PELAMIS, LINNAEUS 1798) FROM A POLE & LINE FISHERY IN MAUMERE-SIKKA, INDONESIA","authors":"Agus Setiyawan, Michael A. Rice, F. Satria, A. Widodo","doi":"10.15578/IFRJ.27.1.2021.37-49","DOIUrl":"https://doi.org/10.15578/IFRJ.27.1.2021.37-49","url":null,"abstract":"Several population parameters of skipjack tuna (Katsuwonus pelamis) taken by pole and line gear from Maumere Waters from March 2017 to February 2018 were analyzed. A total of 2,194 skipjack tuna was sampled randomly. Fishing activities were carried out around FADs (Fish Aggregating Devices) and free fish shoal. Observers and enumerators collected data from several landing sites and by direct on-board observations. This study aims to provide length-frequency distribution by season, estimate growth mortality parameters, and estimate stock exploitation rate using FISAT software. The results showed that the total catch was dominated by skipjack tuna; up to 80% with the CPUE of 30.8 kg/person/trip, and the skipjack tuna’s length distribution ranged from 26 to 69 cm FL. Length at first capture (Lc) was 34.71 cm FL, and immature fish dominated the total catch with 53%, indicating growth overfishing. The calculated von Bertalanffy growth (VBG) parameters were L= 70.35 cm, K = 0.55 yr-1, and t0 = -0.39 yr. Natural mortality (M) was estimated to be 0.92 and fishing mortality (F) was 0.91. The mean longevity of skipjack tuna is estimated to be 3.2 years, with an exploitation rate (E) of 0.50. Sustainable exploitation of skipjack tuna determined from this analysis could be developed with an Emax of 0.73. There is a focus on reducing the catch of immature fish through various methods that include changing the fishing target area from FADs to fishing on natural fish schools and using gear modifications such as larger-sized (lower number) hooks.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"27 1","pages":"37-49"},"PeriodicalIF":0.0,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46962699","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 : 2020-12-11DOI: 10.15578/ifrj.25.2.2019.113-122
O. Olopade, H. Dienye, U. Nworgu
This study aimed to determine the growth patterns, mortality, and exploitation status of two species of Alestidae in the New Calabar River, Nigeria. For this purpose, fish samples were collected monthly from three landing sites from the local fishermen using gill nets (mesh sizes: 15-25mm), beach seine (mesh sizes: 2.3-10mm), and cast nets (mesh sizes: 15 -25mm). The length-weight relationship revealed exponent “b” value for Brycinus nurse was 3.54 and 3.21 for Brycinus macrolepidotus while the condition factors were 1.08 and 1.02 for Brycinus nurse and Brycinus macrolepidotus respectively. The growth parameters of Brycinus nurse asymptotic length (L) and growth coefficient (K) were 24.46 cm and 0.52 yr-1, respectively, while those for Brycinus macrolepidotus L was 28.88 cm and K was 0.22 yr-1. The reproductive load (L50/L) ratio was found to be 0.59 and 0.61 for B. nurse and B. macrolepidotus, respectively. Exploitation rate (E) for B. nurse was 0.26 and 0.11 for B. macrolepidotus while length-at-first capture (Lc) was 14.49 cm for B. nurse and 17.64 cm for B. macrolepidotus. The natural mortality was greater than the fishing mortality for both species and Logistic regression of the probability of capture routine values recorded for B. nurse were higher than that of B. macrolepidotus. Maximum exploitation rate (Emax) was less than 0.5 for both B. nurse (0.41) and B. macrolepidotus (0.42). These values were close to the maximum allowable limit; therefore, the species may be unsustainable when fishery intensifies in the future. To ensure sustainable exploitation of the two Alestid species in the area, fishing effort should be regulated.
{"title":"ESTIMATION OF GROWTH, MORTALITY, AND EXPLOITATION STATUS OF NURSE TETRA (Brycinus nurse) AND TRUE BIG SCALE TETRA (Brycinus macrolepidotus) (FAMILY: ALESTIDAE) FROM THE NEW CALABAR RIVER, NIGERIA","authors":"O. Olopade, H. Dienye, U. Nworgu","doi":"10.15578/ifrj.25.2.2019.113-122","DOIUrl":"https://doi.org/10.15578/ifrj.25.2.2019.113-122","url":null,"abstract":"This study aimed to determine the growth patterns, mortality, and exploitation status of two species of Alestidae in the New Calabar River, Nigeria. For this purpose, fish samples were collected monthly from three landing sites from the local fishermen using gill nets (mesh sizes: 15-25mm), beach seine (mesh sizes: 2.3-10mm), and cast nets (mesh sizes: 15 -25mm). The length-weight relationship revealed exponent “b” value for Brycinus nurse was 3.54 and 3.21 for Brycinus macrolepidotus while the condition factors were 1.08 and 1.02 for Brycinus nurse and Brycinus macrolepidotus respectively. The growth parameters of Brycinus nurse asymptotic length (L) and growth coefficient (K) were 24.46 cm and 0.52 yr-1, respectively, while those for Brycinus macrolepidotus L was 28.88 cm and K was 0.22 yr-1. The reproductive load (L50/L) ratio was found to be 0.59 and 0.61 for B. nurse and B. macrolepidotus, respectively. Exploitation rate (E) for B. nurse was 0.26 and 0.11 for B. macrolepidotus while length-at-first capture (Lc) was 14.49 cm for B. nurse and 17.64 cm for B. macrolepidotus. The natural mortality was greater than the fishing mortality for both species and Logistic regression of the probability of capture routine values recorded for B. nurse were higher than that of B. macrolepidotus. Maximum exploitation rate (Emax) was less than 0.5 for both B. nurse (0.41) and B. macrolepidotus (0.42). These values were close to the maximum allowable limit; therefore, the species may be unsustainable when fishery intensifies in the future. To ensure sustainable exploitation of the two Alestid species in the area, fishing effort should be regulated.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"25 1","pages":"113-122"},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44673405","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 : 2020-12-08DOI: 10.15578/ifrj.26.2.2020.119-130
T. Hidayat, M. Boer, M. Kamal, Z. Zairion, A. Suman
Longtail tuna (Thunnus tonggol) is one of common economically important pelagic fish species in Indonesia. The objective of this study is examining the biology of reproduction, consisting of length of weight relationship, sex ratio, maturity stage, gonado somatic index (GSI), length at first capture, and length at first maturity and spawning pattern. A total of 633 longtail tuna, ranging 29-58 cmFL and consisting of 293 males and 340 females, were collected from the Java Sea between April 2018 and March 2019. The results showed that the longtail tuna growth pattern was isometric. The sex ratio was not significantly different between male and female. The length of first capture longtail tuna of drift gillnet (43.2 cmFL) was bigger than the length at first maturity (42,3 cmFL). This indicates that the most of longtail tuna caught by drift gillnet have already spawned. The peak’s spawning season occurred in May and November, with fecundity ranging from 783,597 1,579,160 eggs. Longtail tuna has multiple spawning pattern.
{"title":"REPRODUCTIVE BIOLOGY OF LONGTAIL TUNA (Thunnus tonggol) IN THE JAVA SEA","authors":"T. Hidayat, M. Boer, M. Kamal, Z. Zairion, A. Suman","doi":"10.15578/ifrj.26.2.2020.119-130","DOIUrl":"https://doi.org/10.15578/ifrj.26.2.2020.119-130","url":null,"abstract":"Longtail tuna (Thunnus tonggol) is one of common economically important pelagic fish species in Indonesia. The objective of this study is examining the biology of reproduction, consisting of length of weight relationship, sex ratio, maturity stage, gonado somatic index (GSI), length at first capture, and length at first maturity and spawning pattern. A total of 633 longtail tuna, ranging 29-58 cmFL and consisting of 293 males and 340 females, were collected from the Java Sea between April 2018 and March 2019. The results showed that the longtail tuna growth pattern was isometric. The sex ratio was not significantly different between male and female. The length of first capture longtail tuna of drift gillnet (43.2 cmFL) was bigger than the length at first maturity (42,3 cmFL). This indicates that the most of longtail tuna caught by drift gillnet have already spawned. The peak’s spawning season occurred in May and November, with fecundity ranging from 783,597 1,579,160 eggs. Longtail tuna has multiple spawning pattern.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"26 1","pages":"119"},"PeriodicalIF":0.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47211855","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 : 2020-12-08DOI: 10.15578/ifrj.26.2.2020.107-117
O. Olopade, H. Dienye, Ogheneforon Oderhohwo, N. Bamidele
The aim of this study was to analyze fish species caught by gill nets and fish diversity of the New Calabar River. Three sampling stations were set based on the coverage situation of the river and ichthyofauna associated with gill nets were sampled twice monthly from February to July 2018. A total of 3,251 fish specimens, representing 11 orders, 15 families, and 28 species, were captured. The order Perciformes was identified as the most abundant representing five families while the remaining had one family each. The fish family Cichlidae was the most represented with seven species, and other notable families were Alestidae, Clupeidae, and Mugilidae, representing three species each. Prominent among the fish caught monthly included Liza falcipinnis, Mugil cephalus, Sarotherodon melanotheron, Sarotherodon galilaeus, Coptodon guineensis, and Sardinella maderensis. The mean catch per unit effort (CpUE) ranged from 3.15±0.2 to 4.85±0.2 kg unit day. Results of diversity indices revealed that Shannon-Wiener index values varied between 2.64 and 2.82, Simpson diversity ranged from 0.07 to 0.10, and Pielou’s evenness index values ranged from 0.85 to 0.95. The values obtained in this study showed that the status of fish diversity in New Calabar River was stable.
{"title":"CATCHABILITY AND DIVERSITY OF FISH SPECIES CAPTURED BY GILL NET IN NEW CALABAR RIVER, NIGERIA","authors":"O. Olopade, H. Dienye, Ogheneforon Oderhohwo, N. Bamidele","doi":"10.15578/ifrj.26.2.2020.107-117","DOIUrl":"https://doi.org/10.15578/ifrj.26.2.2020.107-117","url":null,"abstract":"The aim of this study was to analyze fish species caught by gill nets and fish diversity of the New Calabar River. Three sampling stations were set based on the coverage situation of the river and ichthyofauna associated with gill nets were sampled twice monthly from February to July 2018. A total of 3,251 fish specimens, representing 11 orders, 15 families, and 28 species, were captured. The order Perciformes was identified as the most abundant representing five families while the remaining had one family each. The fish family Cichlidae was the most represented with seven species, and other notable families were Alestidae, Clupeidae, and Mugilidae, representing three species each. Prominent among the fish caught monthly included Liza falcipinnis, Mugil cephalus, Sarotherodon melanotheron, Sarotherodon galilaeus, Coptodon guineensis, and Sardinella maderensis. The mean catch per unit effort (CpUE) ranged from 3.15±0.2 to 4.85±0.2 kg unit day. Results of diversity indices revealed that Shannon-Wiener index values varied between 2.64 and 2.82, Simpson diversity ranged from 0.07 to 0.10, and Pielou’s evenness index values ranged from 0.85 to 0.95. The values obtained in this study showed that the status of fish diversity in New Calabar River was stable.","PeriodicalId":31292,"journal":{"name":"Indonesian Fisheries Research Journal","volume":"26 1","pages":"107"},"PeriodicalIF":0.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48659478","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}
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