scholarly journals Investigating trade-offs in alternative catch share systems: an individual-based bio-economic model applied to the Bay of Biscay sole fishery

2018 ◽  
Vol 75 (10) ◽  
pp. 1663-1679 ◽  
Author(s):  
Manuel Bellanger ◽  
Claire Macher ◽  
Mathieu Merzéréaud ◽  
Olivier Guyader ◽  
Christelle Le Grand
Keyword(s):  
Economic Model ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Sustainable Yield ◽  
Bay Of Biscay ◽  
Socioeconomic Impacts ◽  
Individual Transferable Quota ◽  
Trade Offs ◽  
Solea Solea ◽  
Quota Management

An individual-based bio-economic model is presented and applied to the Bay of Biscay sole (Solea solea) fishery to investigate alternative quota management systems from a multicriteria perspective. For this study, the model integrates several institutional arrangements related to catch share management. The current French co-management system with nontransferability of quota is compared with an alternative individual transferable quota (ITQ) system in a context of transition to maximum sustainable yield. Trade-offs between ecological and socioeconomic impacts are highlighted and the effectiveness of governance scenarios is discussed in regard to the challenge of capacity adjustment. Results emphasize that the introduction of ITQs is expected to reduce by 40% the number of vessels in the fishery. While effectively mitigating the economic impacts of the transition phase to maximum sustainable yield, ITQs are also expected to increase substantially the fishing effort by trawlers, which may cause ecological concerns. The scenarios tested also include the simulation of a decommissioning scheme where subsequent decommissioned vessels are considerably different from the vessels that would lease out their quotas in an ITQ system, resulting in differentiated ecological and socioeconomic impacts between scenarios.

scholarly journals PENDUGAAN POTENSI SUMBERDAYA PERIKANAN LAUT DAN TINGKAT KERAGAAN EKONOMI PENANGKAPAN IKAN (KASUS DI TPI SENDANG BIRU KABUPATEN MALANG)

2011 ◽  
Vol 12 (2) ◽  
pp. 113-126
Author(s):  
Hulaifi Hulaifi
Keyword(s):  
Economic Model ◽  
Negative Impact ◽  
Positive Impact ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Survey Method ◽  
Sustainable Yield ◽  
Maximum Economic Yield ◽  
Negative Impacts ◽  
Method Analysis

The Increased fishing intensity will provide positive and negative impacts. Positive impact is an increase in production that can provide benefits, while the negative impact is eventually decline in production catches. The purpose of this research is potential of Estimating Maximum Sustainable Yield (MSY) in Malang Regency could still be maintained. MSY at the level of Maximum Economic Yield (MEY). Optimization of fishing effort and analysis economic eligibility fishing effort. The method of research using the survey method, Analysis of the data used is static Bio-economic model, and Gorden-Schaefer model. While the research results obtained MEY value of 5,789,952. kg/year and the actual conditions, a production of 5,221,781 kg/year and MSY of 5,829,206 kg/year, the rate of 90% utilization optimization, and optimal fishing levels have exceeded MSY. The advantage of fishermen in biology and economics as much as 5,789,952 kg/year. Conclusion The results showed that the water condition in Malang Regency was not economically efficient, because already there is excess fishing effort. Optimization needs to be done by limiting fishing effort, intensified fishing activities in deeper waters.  

scholarly journals Partial fishing mortality per fishing trip: a useful indicator of effective fishing effort in mixed demersal fisheries

2006 ◽  
Vol 63 (3) ◽  
pp. 556-566 ◽  
Author(s):  
Adriaan D. Rijnsdorp ◽  
Niels Daan ◽  
Willem Dekker
Keyword(s):  
Fishing Effort ◽  
Fine Tuning ◽  
Positive Trend ◽  
Fishing Mortality ◽  
Auxiliary Equipment ◽  
Solea Solea ◽  
Seasonal And Spatial Variations ◽  
Sea Beam ◽  
Quota Management ◽  
Engine Power

Abstract Effort management has been proposed as an alternative for quota management in mixed demersal fisheries. It requires a metric to estimate the fishing mortality imposed by a given quantity of nominal fishing effort. Here, we estimate the partial fishing mortality rate imposed by one unit of fishing effort (Fpue) during individual fishing trips and explore the usefulness of this indicator for managing North Sea beam trawlers >300 hp targeting sole (Solea solea) and plaice (Pleuronectes platessa). Fpue is positively related to vessel engine power, and increased annually by 2.8% (sole) and 1.6% (plaice). The positive trend was due to an increase in skipper skills and investment in auxiliary equipment, the replacement of old vessels by new ones and, to a lesser extent, to upgrade engines. The average Fpue imposed per day at sea by a 2000 hp beam trawler was estimated to be 1.0 × 10−5 (sole) and 0.6 × 10−5 (plaice), and it showed substantial seasonal and spatial variations. The Fpue of sole and plaice were negatively related in summer and showed no relationship in winter. The existence of predictive seasonal and spatial patterns in Fpue opens up the possibility of fine-tuning management by directed effort restrictions and uncoupling management of plaice and sole.

scholarly journals Sustainable Potential of Tuna Fishery Around the Waters of North Sulawesi Province Based on Data from the Bitung Ocean Fisheries Port (PPS)

2019 ◽  
Vol 10 (1) ◽  
pp. 18
Author(s):  
Donald H. Simanjuntak ◽  
Lawrence J. L. Lumingas ◽  
Joudy R. R. Sangari
Keyword(s):  
Secondary Data ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Production Model ◽  
Utilization Rate ◽  
Sustainable Yield ◽  
North Sulawesi ◽  
Surplus Production Model ◽  
Tuna Fishing ◽  
Tuna Fisheries

This research was conducted in the city of Bitung, North Sulawesi Province with activities centered on the Bitung Ocean Fisheries Port (PPS), which began from mid March to April 2019. The fishing activities studied are using the fishing areas around the waters of  North Sulawesi Province namely the Sulawesi Sea and The Maluku Sea which are included in WPP 715 and 716 based on tuna catch landed data on PPS Bitung. The purpose of this study was to analyze the value of sustainable potential by looking at the level of utilization and Maximum Sustainable Yield (MSY) of tuna in the waters around North Sulawesi Province based on a surplus production model approach (Schaefer Model). This research is expected to be used as a consideration in the management of tuna stocks around the waters of North Sulawesi Province, and can be used as a basis for further research. This study uses a secondary data collection method in the form of fishery statistics documents. The data used are data from tuna fishing and fishing (effort), from 2014 to 2018 (5 years). The results showed that the sustainable potential of tuna fisheries around the waters of North Sulawesi Province based on North Sulawesi PPS data indicated that, the sustainable potential value of tuna that could be caught was 14,173.51 tons / year which is counted as 80% of the value of tuna resources around the waters of North Sulawesi Province. PPS Bitung data which amounted to 17,716.15 tons / year for Hmsy, 1,200.15 trips / year for Emsy, with an average CPUE value of 2014-2018 of 19 tons / trip. The level of tuna utilization around the waters of North Sulawesi Province is based on data from PPS Bitung in 2014, 2017 and 2018 which indicate that there were indications of overfishing with the largest utilization rate in 2014 which reached a value of 155.09%.Keywords: tuna, Bitung, Bitung PPS, sustainable potential, MSY. ABSTRAKKegiatan penelitian ini berlangsung di Kota Bitung, Provinsi Sulawesi Utara dengan kegiatan berpusat di Pelabuhan Perikanan Samudera (PPS) Bitung, yang dimulai  dari pertengahan bulan Maret hingga bulan April 2019. Aktivitas perikanan tangkap yang ditelaah berlangsung di sekitar perairan Provinsi Sulawesi Utara yaitu Laut Sulawesi dan Laut Maluku yang masuk ke dalam WPP 715 dan 716 berdasarkan data tangkapan tuna yang didaratkan di PPS Bitung. Tujuan dari penelitian ini adalah untuk menganalisis nilai potensi lestari dengan melihat tingkat pemanfaatan dan maximum sustainable yield (MSY) ikan tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan pendekatan model produksi surplus (Model Schaefer). Penelitan ini diharapkan dapat digunakan sebagai bahan pertimbangan dalam pengelolaan stok ikan tuna di sekitar perairan Provinsi Sulawesi Utara, serta dapat digunakan sebagai dasar untuk penelitian selanjutnya.  Penelitian ini menggunakan metode pengumpulan data sekunder berbentuk dokumen. Data yang diambil adalah data tangkapan ikan tuna dan upaya penangkapan ikan atau effort (trip), dari tahun 2014 sampai dengan 2018 (5 Tahun). Hasil penelitian menunjukkan potensi lestari perikanan tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan data PPS Bitung Sulawesi Utara nilai potensi lestari tuna yang bisa ditangkap adalah 14.173,51 ton/tahun 80% dari nilai pemanfaatan sumber daya perikanan tangkap tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan data PPS Bitung yang sebesar 17.716,15 ton/tahun untuk Hmsy, 1.200,15 trip/tahun untuk Emsy, dengan nilai CPUE rata-rata tahun 2014-2018 sebesar 19 ton/trip. Tingkat pemanfaatan tuna di sekitar perairan Provinsi Sulawesi Utara berdasarkan data PPS Bitung Sulawesi Utara di tahun 2014,2017 dan 2018 sudah yang menandakan adanya indikasi overfishing dengan tingkat pemanfaatan terbesar di tahun 2014 yang mencapai nilai 155,09%.Kata Kunci: ikan tuna, Bitung, PPS Bitung, potensi lestari, MSY.

Community Effects of Fishing

2019 ◽  
pp. 200-214
Author(s):  
Ken H. Andersen
Keyword(s):  
Trophic Cascades ◽  
Maximum Sustainable Yield ◽  
Sustainable Yield ◽  
Community Effects ◽  
Predator Prey ◽  
Community Model ◽  
Trade Offs ◽  
Large Predators

This chapter uses the community model to repeat many of the classic impact calculations of a single stock on the entire community. Here, a focus is the appearance of trophic cascades initiated by the removal of large predators. When a component of an ecosystem is perturbed, the effects are not isolated to the component itself but cascade through the ecosystem. Perturbations are mainly propagated through the predator–prey interactions. The chapter also considers the trade-offs between a forage fishery and a consumer fishery, and the extension of the maximum sustainable yield (MSY) concept to the community, before finally returning to the single-stock aspects.

scholarly journals Estimation of the Maximum Sustainable Yield and the Optimal Fishing Effort of the Blue Crab (Callinectes sapidus, Rathbun 1896) of Laguna Madre, Tamaulipas, Mexico

Crustacea ◽  
2020 ◽  
Author(s):  
Jorge Homero Rodriguez Castro ◽  
Sandra Edith Olmeda de la Fuente ◽  
Wanda Ortiz Baez ◽  
Alfonso Correa Sandoval ◽  
Jose Alberto Ramirez de León
Keyword(s):  
Blue Crab ◽  
Callinectes Sapidus ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Sustainable Yield ◽  
Laguna Madre

scholarly journals The good, the bad and the ugly of marine reserves for fishery yields

2015 ◽  
Vol 370 (1681) ◽  
pp. 20140276 ◽  
Author(s):  
Giulio A. De Leo ◽  
Fiorenza Micheli
Keyword(s):  
Stochastic Model ◽  
Larval Dispersal ◽  
Environmental Variability ◽  
Marine Reserves ◽  
Maximum Sustainable Yield ◽  
Social Benefits ◽  
Spatially Explicit ◽  
Sustainable Yield ◽  
Population Abundance ◽  
Quota Management

Marine reserves (MRs) are used worldwide as a means of conserving biodiversity and protecting depleted populations. Despite major investments in MRs, their environmental and social benefits have proven difficult to demonstrate and are still debated. Clear expectations of the possible outcomes of MR establishment are needed to guide and strengthen empirical assessments. Previous models show that reserve establishment in overcapitalized, quota-based fisheries can reduce both catch and population abundance, thereby negating fisheries and even conservation benefits. By using a stage-structured, spatially explicit stochastic model, we show that catches under quota-based fisheries that include a network of MRs can exceed maximum sustainable yield (MSY) under conventional quota management if reserves provide protection to old, large spawners that disproportionally contribute to recruitment outside the reserves. Modelling results predict that the net fishery benefit of MRs is lost when gains in fecundity of old, large individuals are small, is highest in the case of sedentary adults with high larval dispersal, and decreases with adult mobility. We also show that environmental variability may mask fishery benefits of reserve implementation and that MRs may buffer against collapse when sustainable catch quotas are exceeded owing to stock overestimation or systematic overfishing.

scholarly journals POTENSI LESTARI IKAN SELAR KUNING (Selaroides leptolepis) DI PERAIRAN SELAT SUNDA (Population Dynamics of Yellowstripe Scad (Selaroides leptolepis) in Sunda Strait)

2016 ◽  
Vol 5 (1) ◽  
pp. 101 ◽  
Author(s):  
Maizan Sharfina ◽  
Mennofatria Boer ◽  
Yunizar Ernawati
Keyword(s):  
Economic Value ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Growth Patterns ◽  
Purse Seine ◽  
Sustainable Yield ◽  
Market Demand ◽  
Salted Fish ◽  
Frozen Fish ◽  
The One

<p>ABSTRACT<br />Yellowstripe scad included the one of commodity that has an important economic value in the Sunda Strait. Commonly, this species processed by Pandeglang fishermen to be the boiled fish, salted fish, grilled fish, besides it also traded in fresh or frozen fish product. The high market demand can not offset the production of this species from the nature. Therefore, it needed an information about resources of yellowstripe scad in the waters of the Sunda Strait in order to manage it well. The objective of this study was to estimate the maximum sustainable yield (MSY) and the optimum fishing effort (fopt), so that the yellowstripe scad resources in the waters of the Sunda Strait can be utilized optimally and sustainably. Based on the standardization analysis, the purse seine be made the standard fishing gear for estimating the MSY of yellowstripe scad. The yellowstripe scad growth patterns during the study is isometric. Trends of CPUE of the yellowstripe scad fisheries tends to decrease during 2003 to 2013. Then, this species was estimated its maximum sustainable yield (MSY) of 304.50 tons per year, with the optimum fishing effort of 12.478 trips per year. The decline of the catch per fishing effort can indicated that the yellowstripe scad fishing conditions in the Sunda Strait was having the overfishing phenomenon.</p><p><br />Key words: Sunda Strait, sustainable potential, yellowstripe scad</p><p>-------</p><p>ABSTRAK</p><p><br />Ikan selar kuning termasuk salah satu komoditas perikanan yang memiliki nilai ekonomis penting di perairan Selat Sunda. Jenis ikan ini, selain banyak dimanfaatkan oleh nelayan sekitar Kabupaten Pandeglang sebagai ikan pindang, ikan bakar, ikan asin, juga diperdagangkan dalam keadaan segar maupun dibekukan. Tingginya permintaan pasar tidak dapat mengimbangi produksi ikan tersebut di alam. Oleh karena itu, untuk memperoleh informasi mengenai tingkat pemanfaatan sumber daya ikan selar kuning di perairan Selat Sunda, diperlukan suatu kajian mengenai potensi lestari ikan selar kuning. Tujuan dari penelitian ini adalah untuk mengetahui hasil tangkapan maksimum lestari (maximum sustainable yield atau MSY) serta upaya penangkapan maksimum lestari (fopt) sehingga sumberdaya ikan selar kuning di Perairan Selat Sunda dapat dimanfaatkan secara optimal dan berkelanjutan. Berdasarkan hasil standardisasi, alat tangkap standart yang digunakan adalah purse seine. Pola pertumbuhan ikan selar kuning selama penelitian, yaitu isometrik. Hasil perhitungan CPUE menunjukkan adanya produksi yang cenderung menurun dengan upaya penangkapan yang meningkat dari tahun 2003 sampai 2013. Hasil perhitungan potensi hasil tangkapan maksimum lestari (MSY) diestimasi sebesar 304,50 ton per tahun, dan upaya penangkapan optimumnya adalah 12.478 trip per tahun. Penurunan hasil tangkapan per upaya penangkapan dapat dijadikan salah satu indikasi bahwa kondisi penangkapan ikan selar kuning di Perairan Selat Sunda sedang mengalami gejala lebih tangkap atau overfishing.</p><p><br />Kata kunci: Selat Sunda, potensi lestari, ikan selar kuning</p>

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

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.

scholarly journals PENGELOLAAN BERKELANJUTAN PERIKANAN TANGKAP WADUK CIRATA : MODEL BIO-EKONOMI

2016 ◽  
Vol 11 (2) ◽  
pp. 161
Author(s):  
Zuzy Anna
Keyword(s):  
Parameter Estimation ◽  
Open Access ◽  
Fisheries Management ◽  
Economic Model ◽  
Gompertz Model ◽  
Maximum Sustainable Yield ◽  
Policy Implications ◽  
Fishing Gear ◽  
Sustainable Yield ◽  
Maximum Economic Yield

Perikanan tangkap di waduk, merupakan potensi yang dapat diandalkan bagi pemenuhan kebutuhan hidup masyarakat sekitarnya, sayangnya kegiatan ini belum banyak mendapat perhatian pengelolaan. Terbukti dari masih sangat rendahnya kontribusi sektor perikanan tangkap waduk ini pada perekonomian daerah. Untuk digunakan sebagai basis pengelolaan, penelitian ini dilakukan untuk menganalisis  pengaruh aktivitas produksi (penangkapan) terhadap kondisi sumber daya ikan seperti parameter biologi dan rente sumberdaya perikanan pada kondisi aktual, lestari, dan juga optimal, dengan menggunakan model bio-ekonomi standard logistik dan Gompertz. Skenario model yang digunakan adalah analisis bio-ekonomi model logistik Gordon Schaefer (GS) dengan estimasi parameter algoritma Fox, dan model Fox/Gompertz dengan estimasi  parameter biologi seluruhnya algoritma CYP. Analisis perikanan tangkap dilakukan dengan menggunakan skenario rezim pengelolaan open access, Maximum Sustainable Yield (MSY) dan Maximum Economic Yield (MEY). Hasil penelitian menunjukan adanya overfishing dan overcapacity pada beberapa tahun pengamatan yang ditandai dengan adanya kelebihan effort baik pada Model GS maupun Gompertz. Pengelolaan dengan menggunakan rezim MEY memberikan nilai rente yang paling maksimum, dengan biomass yang lebih konservatif, dan  effort yang lebih efisien, baik pada model GS maupun model Gompertz. Implikasi kebijakan pengelolaan waduk melalui rasionalisasi jumlah alat tangkap. Model MSY mengisyaratkan rasionalisasi alat tangkap lebih sedikit dibandingkan model MEY, sementara Model Gompertz mengisyaratkan penurunan alat tangkap lebih tinggi dibandingkan model GS. Alternatif pembatasan output atau kuota output juga dapat dilakukan dengan menggunakan nilai JTB. Title: Sustainable Fisheries Management in Cirata Dam: Bio-Economic ModellingCapture fisheries in the dam is a potential that can be relied for the surrounding community subsistence. Unfortunately this activity has not received much attention management. This was evident from the very low dam fisheries contribution, to the regional economy. For the purpose of fisheries management in the dam, this study was conducted to analyze the effect of production activities, on the condition of fish resources such as biological parameters and fishery resource rents on actual conditions, sustainable, and optimally, using bio-economic model of standard logistic and Gompertz. The scenario model used is the analysis of bio-economic model of logistics Gordon Schaefer (GS) with the parameter estimation of Fox algorithm, and  Gompertz model  with algorithm CYP  for biological parameter estimation. Analysis of fisheries carried out by using a scenario of open access management regime, Maximum Sustainable Yield (MSY) and the Maximum Economic Yield (MEY). The results showed overfishing and overcapacity in several years of observation which is characterized by an excess of effort both on the GS model and Gompertz. Management using MEY regime provides the maximum possible value of rents, with biomass more conservative and more efficient effort, both on the GS model and the model of Gompertz. Policy implications reveal from the study is dam management through the rationalization of the number of fishing gear or boats. MSY model suggests rationalization of fishing gear less than the model MEY, while the Gompertz model implies a decrease in fishing gear higher than the GS model. Alternative output restrictions or quotas outputs can also be implemented by using the value of total allowable catch.

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