Catch per unit effort, maximum sustainable yield and exploitation of demersal fish of Omani artisanal fishery

Southern sea lions (Otaria flavescens) forage in coastal fishery grounds in shallow waters, where they interact with coastal fishing activities. The main objective of this research was to evaluate the predation of southern sea lions on artisanal fishery catches and thus determine whether interactions with sea lions affected catches. Between July 1997 and March 1998, we observed 53 fishing events onboard artisanal fishing boats in four localities. The presence and number of sea lions around the boat and the numbers of each fish species consumed by sea lions were recorded by an onboard observer. To estimate the damage caused by sea lions to fishery catches, we considered two scenarios, a conservative scenario and a maximized scenario. Predation on catches was observed in 50.9% of all the fishing events and up to four sea lions were sighted in 67.9% of fishing events. Considering a conservative scenario, predation varied from 0.8 to 9.1% of the catch per unit effort (CPUE) depending on the location. Considering the maximized scenario, predation varied from 3.4 to 46.2%. However, no significant relationship was found between CPUE and the number of sea lions in any locality or with either type of fishing gear. Furthermore, CPUE did not differ in the presence or absence of sea lion interactions and predation per unit effort did not vary between localities or seasons. It was concluded that neither the presence of sea lions nor the damage they cause were responsible for variations in CPUE.

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The demersal fish composition and catch per unit effort of mini bottom trawl at the coast of Demak Regency Central Java

E3S Web of Conferences ◽

10.1051/e3sconf/202132203006 ◽

2021 ◽

Vol 322 ◽

pp. 03006

Author(s):

Naliyana Fitriya ◽

Nahlah Alfiatuunisa ◽

Suwarman Partsuwiryo ◽

Eko Setyobudi

Keyword(s):

Demersal Fish ◽

Bottom Trawl ◽

North Coast ◽

Catch Per Unit Effort ◽

The North ◽

Central Java ◽

Unit Effort ◽

Trichiurus Lepturus ◽

Trawl Fishing ◽

Trawl Catches

Demak is a coastal area on the North Coast of Java with a large enough potential for demersal fish resources. This research aimed to determine the composition, the length and weight distribution, and catch per unit effort (CPUE) of demersal fish caught using mini bottom trawl at the north coast of Demak Regency. The research was carried out in October-December 2020 by observation of ten trips of mini bottom trawl fishing. Each fish captured was then grouped by type, identified, and measured its length and weight. The result showed that 38 species consist of 31 fishes, four mollusks, and three crustaceans. The fish captured dominated by pony fish (Leiognathus equulus) as much as 31.23% and largehead hairtail (Trichiurus lepturus) of 23.52%. The catch per unit effort (CPUE) average of mini bottom trawl was 44.77 kg/trip. Mainly fish (more than 95%) caught in small size compared it’s the maximum attainable length (L-max), with all the weight ranges from 0.3 to 520 g and more than 98% sized 0.3-80 g. Mini bottom trawl catches many types of fish and small size; therefore, mini bottom trawl is classified as a type of fishing gear with a very low selectivity level.

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RESPONSIBLE FISHERIES MANAGEMENT OF MINI PURSE SEINE IN THE LAMPUNG BAY AREA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v8i2.15837 ◽

2017 ◽

Vol 8 (2) ◽

pp. 713-728

Author(s):

Yulia Estmirar Tanjov ◽

Roza Yusfiandayani ◽

. Mustaruddin

Keyword(s):

Fishing Effort ◽

Maximum Sustainable Yield ◽

Pelagic Fish ◽

Purse Seine ◽

Sustainable Yield ◽

Catch Per Unit Effort ◽

Small Pelagic Fish ◽

Bay Area ◽

Fisheries Resources ◽

The Status

Lempasing is a Coastal Fishing Port (CFP) which located in Bandar Lampung. It is one of the centers of fisheries activities in the city. One of the fishing gear which operated by most of fishermen in Lempasing is mini purse seine. Mini purse seine fishing activities in the Lampung Bay Area and Lempasing CFP is not in accordance with the conditions of the surrounding waters area. The research was conducted in the Lampung Bay Area and Lempasing CFP, Lampung. This study aims to: 1) determine the status of fisheries resources utilization, 2) to describe the dominant fish caught by mini purse seine. Analysis methods were used in this study namely: 1) Fishing Power Index (FPI), Catch Per Unit Effort (CPUE), and Maximum Sustainable Yield (MSY) to determine the status of fisheries resource utilization. The dominant small pelagic fishes caught were scad fish Selaroides sp., mackerel fish Rastrelliger sp., longnose trevally fish Carangoides chrysophrys. The result showed that Fox model was the best fits models with estimated maximum sustainable yield of 15.5 ton and fishing effort of 992 trip/year for mini purse seine. The longnose trevally fish in lampung bay area in do not exceeded the optimal catch fish condition can be used to sustainably. In these condition is necessary to wisely manage and setting the catches to not exceed the allowable catch of the small pelagic fish, so the stock of small pelagic fish in the Lampung Bay Area can be used sustainably.

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Study of Maximum Sustainable Yield of Rabbitfish (Siganus sp.) in Makassar Waters

TORANI: Journal of Fisheries and Marine Science ◽

10.35911/torani.v3i2.11375 ◽

2020 ◽

pp. 98-107

Author(s):

Moh. Tauhid Umar ◽

Sharifuddin Bin Andy Omar ◽

Suwarni Suwarni

Keyword(s):

Time Series Data ◽

Production Method ◽

Maximum Sustainable Yield ◽

Series Data ◽

Annual Data ◽

Sustainable Yield ◽

Catch Per Unit Effort ◽

Total Allowable Catch ◽

Average Production ◽

Fisheries Statistics

This study aims to estimate the potential of fish resources which include catch per unit effort (CPUE), Maximum Sustainable Yield (MSY), optimum efforts, exploitation rates and total allowable catch (TAC) of Rabbitfish in Makassar waters. This study uses time-series data, namely annual data from the fisheries statistics report at the Office of Marine and Fisheries Service, South Sulawesi Province from 2007 until. 2016. The method used to predict fish resource potential in the study is the Surplus Production method referring to the Schaefer model. The results of the study showed that the average production and standard efforts in the 10-year period were 78.8 tons per year and 1304 standard units per year respectively. The estimation results obtained by MSY and the optimum efforts of rabbitfish per year were 104 tons and 1142 standard units, respectively and total allowable catches (TAC) are 82.979 tons per year. The level of utilization of rabbitfish resources in Makassar waters in the last three years has been overexploitation.

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RESPONSIBLE FISHERIES MANAGEMENT OF MINI PURSE SEINE IN THE LAMPUNG BAY AREA

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v8i2.15837 ◽

2017 ◽

Vol 8 (2) ◽

pp. 713

Author(s):

Yulia Estmirar Tanjov ◽

Roza Yusfiandayani ◽

. Mustaruddin

Keyword(s):

Fishing Effort ◽

Maximum Sustainable Yield ◽

Pelagic Fish ◽

Purse Seine ◽

Sustainable Yield ◽

Catch Per Unit Effort ◽

Small Pelagic Fish ◽

Bay Area ◽

Fisheries Resources ◽

The Status

Lempasing is a Coastal Fishing Port (CFP) which located in Bandar Lampung. It is one of the centers of fisheries activities in the city. One of the fishing gear which operated by most of fishermen in Lempasing is mini purse seine. Mini purse seine fishing activities in the Lampung Bay Area and Lempasing CFP is not in accordance with the conditions of the surrounding waters area. The research was conducted in the Lampung Bay Area and Lempasing CFP, Lampung. This study aims to: 1) determine the status of fisheries resources utilization, 2) to describe the dominant fish caught by mini purse seine. Analysis methods were used in this study namely: 1) Fishing Power Index (FPI), Catch Per Unit Effort (CPUE), and Maximum Sustainable Yield (MSY) to determine the status of fisheries resource utilization. The dominant small pelagic fishes caught were scad fish Selaroides sp., mackerel fish Rastrelliger sp., longnose trevally fish Carangoides chrysophrys. The result showed that Fox model was the best fits models with estimated maximum sustainable yield of 15.5 ton and fishing effort of 992 trip/year for mini purse seine. The longnose trevally fish in lampung bay area in do not exceeded the optimal catch fish condition can be used to sustainably. In these condition is necessary to wisely manage and setting the catches to not exceed the allowable catch of the small pelagic fish, so the stock of small pelagic fish in the Lampung Bay Area can be used sustainably.

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POTENTIAL PRODUCTION OF DEMERSAL FISH STOCK IN THE MALACCA STRAIT OF INDONESIA

Indonesian Fisheries Research Journal ◽

10.15578/ifrj.21.1.2015.45-52 ◽

2015 ◽

Vol 21 (1) ◽

pp. 45 ◽

Cited By ~ 1

Author(s):

Purwanto Purwanto

Keyword(s):

Demersal Fish ◽

Fishing Effort ◽

Maximum Sustainable Yield ◽

Fish Stock ◽

Sustainable Yield ◽

Optimum Level ◽

Fish Production ◽

Potential Production ◽

Malacca Strait

Malacca Strait is one of the main fishing areas for demersal fishery in Indonesia. To support the management of that fishery, an assessment of the demersal fish stock was conducted. This study estimated that the maximum sustainable yield and the optimal catch per unit effortof demersal fishery in the Malacca Strait were about 106.8 thousand tons/year and 28.5 tons per unit of Danish seine, respectively, resulting from the operation of 3,752 Danish seines. Unfortunately, fishing effort was higher than its optimum level and the fish stock was over-exploited since 2003. To recover the demersal fish stock to its optimum level and to ensure the optimal fish production from demersal fishery in the Malacca Strait, it was necessary to reduce fishing effort at about 67% from its level in 2011.

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Estimating biomass, fishing mortality, and “total allowable discards” for surveyed non-target fish

ICES Journal of Marine Science ◽

10.1093/icesjms/fsu146 ◽

2014 ◽

Vol 72 (2) ◽

pp. 458-466 ◽

Cited By ~ 6

Author(s):

Samuel Shephard ◽

David G. Reid ◽

Hans D. Gerritsen ◽

Keith D. Farnsworth

Keyword(s):

Demersal Fish ◽

Maximum Sustainable Yield ◽

Sustainable Yield ◽

Fishing Mortality ◽

Target Species ◽

Reference Levels ◽

Total Allowable Catch ◽

Target Fish ◽

The Impact ◽

Study Species

Abstract Demersal fisheries targeting a few high-value species often catch and discard other “non-target” species. It is difficult to quantify the impact of this incidental mortality when population biomass of a non-target species is unknown. We calculate biomass for 14 demersal fish species in ICES Area VIIg (Celtic Sea) by applying species- and length-based catchability corrections to catch records from the Irish Groundfish Survey (IGFS). We then combine these biomass estimates with records of commercial discards (and landings for marketable non-target species) to calculate annual harvesting rates (HR) for each study species. Uncertainty is incorporated into estimates of both biomass and HR. Our survey-based HR estimates for cod and whiting compared well with HR-converted fishing mortality (F) estimates from analytical assessments for these two stocks. Of the non-target species tested, red gurnard (Chelidonichthys cuculus) recorded some annual HRs greater than those for cod or whiting; challenging “Pope’s postulate” that F on non-target stocks in an assemblage will not exceed that on target stocks. We relate HR for each species to two corresponding maximum sustainable yield (MSY) reference levels; six non-target species (including three ray species) show annual HRs ≥ HRMSY. This result suggests that it may not be possible to conserve vulnerable non-target species when F is coupled to that of target species. Based on biomass, HR, and HRMSY, we estimate “total allowable catch” for each non-target species.

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Analisis Potensi Lestari Hasil Tangkapan Trammel Net Di Kabupaten Indramayu

Barakuda 45: Jurnal Ilmu Perikanan dan Kelautan ◽

10.47685/barakuda45.v3i1.155 ◽

2021 ◽

Vol 3 (1) ◽

pp. 17-27

Author(s):

Dedi Supriadi ◽

Bangun Ichsanudin ◽

Aman Saputra ◽

Restu Widayaka

Keyword(s):

Research Method ◽

Penaeus Monodon ◽

Fishing Effort ◽

Maximum Sustainable Yield ◽

Fishing Gear ◽

Sustainable Yield ◽

Catch Per Unit Effort ◽

Annual Productivity ◽

One Year ◽

Descriptive Method

This study aims to analyze the Catch Per Unit Effort (CPUE) and Maximum Sustainable Yield (MSY) from the catch of trammel net fishing gear by fishermen in Indramayu Regency, West Java. The research method used is descriptive method, which is a method to create a systematic, factual and accurate description of the facts, characteristics and relationships of environmental factors or phenomena being studied. Data analysis was carried out on the catch and catch effort in the last 5 years (2011-2015) on trammel net fishing gear. Trammel net fishing gear is environmentally friendly fishing gear and is an effective fishing tool in fishing productivity with the composition of the catch consisting of the main catch is tiger shrimp (Penaeus monodon) and bycatch such as tigawaja fish (Johnius belangeri), petek Leiognathus bindus) and layur (Trichyurus haumela). The highest annual productivity of trammel net fishing gear during 2011-2015 occurred in 2011 and 2014 at 0.018 tons / trip and the lowest productivity occurred in 2015 at 0.013 tons / trip, and the maximum sustainable catch or MSY in Indramayu Regency was 32147, 1 ton / year, with an estimated optimum fishing effort of 103516.67 trips for one year and R2 of 0.2977. This study aims to analyze the Catch Per Unit Effort (CPUE) and Maximum Sustainable Yield (MSY) from the catch of trammel net fishing gear by fishermen in Indramayu Regency, West Java. The research method used is descriptive method, which is a method to create a systematic, factual and accurate description of the facts, characteristics and relationships of environmental factors or phenomena being studied. Data analysis was carried out on the catch and catch effort in the last 5 years (2011-2015) on trammel net fishing gear. Trammel net fishing gear is environmentally friendly fishing gear and is an effective fishing tool in fishing productivity with the composition of the catch consisting of the main catch is tiger shrimp (Penaeus monodon) and bycatch such as tigawaja fish (Johnius belangeri), petek Leiognathus bindus) and layur (Trichyurus haumela). The highest annual productivity of trammel net fishing gear during 2011-2015 occurred in 2011 and 2014 at 0.018 tons / trip and the lowest productivity occurred in 2015 at 0.013 tons / trip, and the maximum sustainable catch or MSY in Indramayu Regency was 32147, 1 ton / year, with an estimated optimum fishing effort of 103516.67 trips for one year and R2 of 0.2977.

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Tingkat pemanfaatan ikan kaci-kaci (Diagramma pictum) pada perairan Mapur yang didaratkan di Desa Kelong, Kabupaten Bintan, Indonesia

Akuatikisle Jurnal Akuakultur Pesisir dan Pulau-Pulau Kecil ◽

10.29239/j.akuatikisle.4.1.1-6 ◽

2020 ◽

Vol 4 (1) ◽

pp. 1

Author(s):

Jupitar Jupitar ◽

Susiana Susiana ◽

Febrianti Lestari

Keyword(s):

Research Method ◽

Secondary Data ◽

Demersal Fish ◽

Maximum Sustainable Yield ◽

Fish Distribution ◽

Primary Data ◽

Survey Method ◽

Utilization Rate ◽

Fishing Gear ◽

Sustainable Yield

Mapur waters is one of the potential areas for demersal fish distribution in Bintan waters. The purpose of this study was to investigate the effort of catching painted sweetlips fish (Diagramma pictum), Maximum Sustainable Yield of Painted Sweetlips Fish and investigated the amount of Painted Sweetlips Fish catches allowed (JTB). The research method used is the survey method, which is direct observation at the research location by recording fishing operations such as fishing gear and catches through direct interviews with fishermen working in fish storage warehouses. Data taken in the form of primary data and secondary data. The results showed that the effort of catching Painted Sweetlips Fish on Mapur waters was 314.00 units, with the MSY value was 713,016 kg/unit. So that the amount of catch allowed (JTB) is 80% from MSY which is equal to 570.41 kg/unit, with the utilization rate of Painted Sweetlips Fish on which is equal to 89%.

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Tingkat Pemanfaatan Ikan Umela (Lutjanus vitta) di Perairan Mapur yang didaratkan di Desa Kelong Kecamatan Bintan Pesisir Kabupaten Bintan

Tropical Fisheries Management Journal ◽

10.29244/jppt.v4i2.31955 ◽

2020 ◽

Vol 4 (2) ◽

pp. 1-9

Author(s):

Feni Yanto ◽

Susiana ◽

Wahyu Muzammil

Keyword(s):

Data Retrieval ◽

Maximum Sustainable Yield ◽

Export Market ◽

Primary Data ◽

Survey Method ◽

Utilization Rate ◽

Sustainable Yield ◽

Market Demand ◽

Catch Per Unit Effort ◽

Total Allowable Catch

Brown strip red snapper or umela fish catched by fisherman in Kelong Village by bottom trap called ‘bubu’ in Mapur Waters. That fish high economic value and exported fish because high fish export market demand, as well as umela fish also made processed by society in Kelong Village such as fillet and increase the price in the market. This study was held in September 2018 until April 2020 in the landing fish Kelong Village. The study aimed at analyzed catch per unit effort (CPUE), maximum sustainable yield (MSY), level and utilization effort, as well as the total allowable catch (TAC) in umela fishing in the Mapur Waters that was landed in Kelong Village. The study used survey method, primary data retrieval is conducted with interviews fisherman directly and secondary data consists of supporting documents and literature. Data analysis was used Schaefer model in this study. The results obtained an average value of CPUE of 1.61 kg/unit, and maximum sustainable yield (MSY) value of 795.50 kg/unit with optimum capture effort (f opt) of 796 units, umela fish has not been said overfishing. The utilization rate of umela fish is 60% and categorized as medium, it is still possible to maximize utilization up to 80% followed by government controlled. As well as the total allowable catch (TAC) of 636.4 kg/unit, umela fishing could be upgraded but cannot exceed the conditions.

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