scholarly journals IMPLIKASI MODEL BIOEKONOMI TERHADAP MANAJEMEN PERIKANAN TANGKAP: STUDI KASUS DI PANTAI SELATAN YOGYAKARTA

2003 ◽  
Vol 5 (1) ◽  
pp. 16
Author(s):  
Suadi Suadi ◽  
Soeparno Soeparno ◽  
Retno Widianingroem
Keyword(s):  
Management Strategies ◽  
Maximum Sustainable Yield ◽  
South Coast ◽  
Small Scale ◽  
Free Access ◽  
Sustainable Yield ◽  
Total Revenue ◽  
Total Allowable Catch ◽  
Bargaining Position ◽  
Technology Improvement

Small-scale marine capture fisheries have contributes to community welfare at Yogyakarta’s south coast. Government has planned some programs to develop fisheries. The development supposed only at rational effort in which fishers still gain advantages. Precautionary approach using bio-economic model of Gordon-Schaefer was applied to analyze the issue. The linear regression model of catch per unit of effort (C/f) (CPUE) and effort (f) was C/f = 59,851 – 0,0005f (R2 = 82, 71%). Fish price assumed at Rp 7,735.19 /kg with operational cost of Rp 59,835.67/trip. Total revenue and effort at maximum sustainable yield was predicted at Rp 13,396 billion and 56,860 trip (equals to 327 vessels), respectively. Fisher income at this level was Rp 167,774.51/trip/vessel. Fish exploration level in this area has already closed to total allowable catch. Free access equilibrium in which cost is equal to revenue might reach at effort of 102,231 trip (equals to 568 vessels). Managing fisheries at maximum economic yield might rise fisher income 17.83% comparing to maximum sustainable yield, but total revenue decreased 1.77% at 56.13% of existing effort. Some management strategies should be promoted and regulated for the fishery exploitation. Based on the results, those possible strategy were 1) limiting investment through regulation and permission; 2) improvement of fishers productivity through technology improvement to exploit  under-used fish resources; 3) expanding the fisheries activity to offshore through harbor development and social preparation; 4) marketing improvement through revitalization of fish action; 5) improving hadling and post harvest fish technology through training and extension; 6) the increasing of bargaining position through empowering fishers group; 7) promoting alternate incomes through integrated coastal tourism development; and 8) avoiding competition and conflict through developing Java’s south coast cooperation. Participatory approach in planning, developing and evaluating should be promoted to develop fishery a southern coast of Yogyakarta.

scholarly journals Evaluating management strategies to implement the recovery plan for Iberian hake (Merluccius merluccius); the impact of censored catch information

2009 ◽  
Vol 67 (2) ◽  
pp. 258-269 ◽  
Author(s):  
Ernesto Jardim ◽  
Santiago Cerviño ◽  
Manuela Azevedo
Keyword(s):  
Management Strategies ◽  
Maximum Sustainable Yield ◽  
Sustainable Yield ◽  
Fishing Mortality ◽  
Merluccius Merluccius ◽  
Total Allowable Catch ◽  
Recovery Plan ◽  
Stock Biomass ◽  
Spawning Stock ◽  
The Impact

Abstract Jardim, E., Cerviño, S., and Azevedo, M. 2010. Evaluating management strategies to implement the recovery plan for Iberian hake (Merluccius merluccius); the impact of censored catch information. – ICES Journal of Marine Science, 67: 258–269. Iberian hake assessment revealed an increase in fishing mortality (F) despite enforcement of a recovery plan. Recent landings exceeded the total allowable catch and discarding rates were high. Alternative management strategies based on F control were evaluated with respect to the probability of recovering spawning-stock biomass (SSB), expected profits, and robustness to uncertainty on catch information and stock dynamics. Results showed that the use of censored catch data, i.e. excluding the Gulf of Cádiz or discards, may lead to inappropriate conclusions. Reducing fishing mortality was necessary for SSB to recover. An Fmax strategy with discard reduction showed the highest probability of rebuilding SSB and led the fishery to sustainable exploitation, with an expected %SPR of 30–40% in 2025, mean individual weight in the landings of 450 g in 2015, and yield increasing by >20%. Because of uncertainty in the estimates of maximum sustainable yield, management strategies based on FMSY were least robust, but all strategies were robust to alternative stock–recruit models.

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

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.

scholarly journals Evaluation of the robustness of maximum sustainable yield based management strategies to variations in carrying capacity or migration pattern of Atlantic bluefin tuna (Thunnus thynnus)

2007 ◽  
Vol 64 (5) ◽  
pp. 837-847 ◽  
Author(s):  
Laurence T Kell ◽  
Jean-Marc Fromentin
Keyword(s):  
Carrying Capacity ◽  
Management Strategy ◽  
Stock Assessment ◽  
Management Strategies ◽  
Maximum Sustainable Yield ◽  
Reference Points ◽  
Sustainable Yield ◽  
Size Limit ◽  
Atlantic Bluefin Tuna ◽  
Spawning Stock

In this study, we examine the performances of current stock assessment methods with respect to their ability to (i) provide estimates of maximum sustainable yield (MSY), FMSY, and BMSY and (ii) assess stock status and exploitation level relative to MSY targets. The robustness of the current International Commission for the Conservation of Atlantic Tunas (ICCAT) management strategy is then evaluated with respect to uncertainty about the true population dynamics and contrasted with a simpler management strategy based solely on a size limit. Reference points are more robust to dynamic uncertainty than the estimates of absolute values and trends in F and spawning stock biomass. However, their performances depend on the underlying dynamics (they perform better when fluctuations come from changes in the carrying capacity than migration) and on when they are implemented relative to the intrinsic cycle of the population. Reference points based on F were less biased and more precise than those based on biomass and (or) yield. Although F0.1 appeared to be the best proxy for FMSY, it cannot indicate past and current levels of exploitation relative to FMSY when there is uncertainty about the dynamics. Finally, the F0.1 management strategy of ICCAT performed only slightly better than a simpler strategy based on size limit and led to lower catch levels.

scholarly journals An evaluation of the collapse and recovery of the yellowtail flounder (Limanda ferruginea) stock on the Grand Bank

2010 ◽  
Vol 67 (9) ◽  
pp. 1887-1895 ◽  
Author(s):  
William B. Brodie ◽  
Stephen J. Walsh ◽  
Dawn Maddock Parsons
Keyword(s):  
Key Management ◽  
Management Strategies ◽  
Maximum Sustainable Yield ◽  
Climatic Conditions ◽  
Sustainable Yield ◽  
Fishing Mortality ◽  
Precautionary Approach ◽  
Yellowtail Flounder ◽  
Limanda Ferruginea ◽  
Management Measures

Abstract Brodie, W. B., Walsh, S. J., and Maddock Parsons, D. 2010. An evaluation of the collapse and recovery of the yellowtail flounder (Limanda ferruginea) stock on the Grand Bank. – ICES Journal of Marine Science, 67: 1887–1895. In 1994, the biomass of yellowtail flounder on the Grand Bank had declined to 20% of the biomass associated with the maximum sustainable yield (Bmsy) because of overfishing in the 1980s, and the Northwest Atlantic Fisheries Organization (NAFO) declared a moratorium on fishing of this stock (and several others in the area). After 4 years of moratorium, the biomass had quadrupled, the fishery was reopened, and the biomass is now well above Bmsy. Based on advice developed within a precautionary approach framework, total allowable catches were set corresponding to a fishing mortality of ≤0.67 × Fmsy. When the fishery was reopened in 1998, several measures to reduce the fishing mortality and ensure continued recovery were introduced. We review and evaluate the science and the management strategies developed during the decline, collapse, and recovery, noting that yellowtail flounder is the only groundfish stock on the Grand Bank that has fully recovered after its collapse. Key management measures included the elimination of fishing by non-NAFO vessels, protection of strong year classes, and keeping the fishing mortality below 0.67 × Fmsy. Although overfishing is viewed as causing the stock decline, productivity was strongly affected by climatic conditions during the collapse and recovery. Changes in water temperature coincided with major changes in the catch and fishing mortality.

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

2014 ◽  
Vol 72 (2) ◽  
pp. 458-466 ◽  
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.

scholarly journals Achieving maximum sustainable yield in mixed fisheries: a management approach for the North Sea demersal fisheries

2016 ◽  
Vol 74 (2) ◽  
pp. 566-575 ◽  
Author(s):  
Clara Ulrich ◽  
Youen Vermard ◽  
Paul J. Dolder ◽  
Thomas Brunel ◽  
Ernesto Jardim ◽  
...  
Keyword(s):  
North Sea ◽  
Regional Scale ◽  
Single Species ◽  
Maximum Sustainable Yield ◽  
Management Approach ◽  
Sustainable Yield ◽  
Total Allowable Catch ◽  
The North ◽  
Trade Offs ◽  
The North Sea

Achieving single species maximum sustainable yield (MSY) in complex and dynamic fisheries targeting multiple species (mixed fisheries) is challenging because achieving the objective for one species may mean missing the objective for another. The North Sea mixed fisheries are a representative example of an issue that is generic across most demersal fisheries worldwide, with the diversity of species and fisheries inducing numerous biological and technical interactions. Building on a rich knowledge base for the understanding and quantification of these interactions, new approaches have emerged. Recent paths towards operationalizing MSY at the regional scale have suggested the expansion of the concept into a desirable area of “pretty good yield”, implemented through a range around FMSY that would allow for more flexibility in management targets. This article investigates the potential of FMSY ranges to combine long-term single-stock targets with flexible, short-term, mixed-fisheries management requirements applied to the main North Sea demersal stocks. It is shown that sustained fishing at the upper bound of the range may lead to unacceptable risks when technical interactions occur. An objective method is suggested that provides an optimal set of fishing mortality within the range, minimizing the risk of total allowable catch mismatches among stocks captured within mixed fisheries, and addressing explicitly the trade-offs between the most and least productive stocks.

scholarly journals Pengelolaan Perikanan Skala Kecil di Perairan Pesisir Kota Semarang

2021 ◽  
Vol 26 (2) ◽  
pp. 167-176
Author(s):  
Jamaludin Malik ◽  
Dietriech Geoffrey Bengen ◽  
Taryono Taryono
Keyword(s):  
Fisheries Management ◽  
Maximum Sustainable Yield ◽  
Small Scale ◽  
Sustainable Yield ◽  
Optimal Production ◽  
Small Scale Fisheries ◽  
Fishery Resources ◽  
Main Target ◽  
Rastrelliger Kanagurta ◽  
Strategic Policies

Overfishing can occur in open access fisheries, where fishermen conduct fishing activities without restrictions. Fisheries management based on biological factors alone (Maximum Sustainable Yield approach) is considered inadequate because it does not consider socio-economic aspects in fisheries management. The study aims to analyze the utilization of small-scale fishery resources in Semarang City and determine its policies to be sustainable. Bioeconomic analysis was used to optimize the utilization of fishery resources. Small-scale fisheries management strategic policies, used analysis of Interpretative Structural Modeling (ISM). The results showed utilization of small scale fishery resources in Semarang City can be achieved with optimal production of anchovy (Stolephorus spp.) 1,477.79 tons/year and optimal effort of 324 units; optimal production of Tembang (Sardinella fimbriata) 235.96 tons/year and optimal effort of 516 units; optimal production of mackerel (Rastrelliger kanagurta) 28.51 tons/year and optimal effort of 479 units; and optimal production of Petek (Leiognathus sp.) 25.54 tons/year and optimal effort of 847 units. In conclusion, the Anchovy (Stolephorus spp.) resources have experienced overfishing since 2007-2008; Mackerel (Rastrelliger kanagurta) resources overfishing occurred from 2009-2015; and Petek (Leiognathus sp.) resources have experienced overfishing since 2014-2016; while Tembang (Sardinella fimbriata) resources have not experienced overfishing because they are not the main target. The key sub-elements of small-scale fisheries management in Semarang City include: a) fishermen; b) Semarang City Fisheries Agency; c) overcapacity; d) decreasing catches; e) environmentally unfriendly arrests; f) ineffective regulation; g) conservation fish resources; h) increasing fishermen's income; i) limitation environmentally unfriendly fishing gear. Keywords: bioeconomic, fisheries, management, MEY, Maximum Sustainable Yield

scholarly journals A Stochastic Model for the Management of the Northwestern Atlantic Harp Seal (Pagophilus groenlandicus) Population

1977 ◽  
Vol 34 (8) ◽  
pp. 1155-1187 ◽  
Author(s):  
Patrick F. Lett ◽  
Terje Benjaminsen
Keyword(s):  
Stochastic Model ◽  
Population Size ◽  
Management Strategies ◽  
High Arctic ◽  
Maximum Sustainable Yield ◽  
Future Research ◽  
Total Allowable Catch ◽  
Stock Size ◽  
Pagophilus Groenlandicus ◽  
Scientific Arguments

Advice from the scientific advisers under the auspices of ICNAF to the international commissioners for 1977 was that the total allowable catch (TAC) for harp seals (Pagophilus groenlandicus) should not exceed 170,000. This advice, in part, was based on the scientific arguments presented in this paper. A stochastic model is developed that takes into account the variations in natural mortality and the landsmen's high arctic and Greenland catches. The Canadian–Norwegian large vessel hunt is controlled under quota regulations. The model is nonlinear, a result of changes in fertility and fecundity rates in response to shifts in population size. The maximum sustainable yield (MSY) 1 + population size is determined to be 1.6 million seals, or a breeding stock size of 375,000 seals. The MSY is approximately 240,000 seals assuming the hunt continues its present pattern. The 240,000 can further be split into 200,000 pups and 40,000 1 + seals. Present stock size is approximately 1.2 million and a TAC of 170,000 seals will allow the population size to reach to MSY level in 10–15 yr. A number of other management strategies are considered, in addition to prospects for future research.

scholarly journals Maximum Sustainable Yield for the Passur river fishery of Bangladesh by using Surplus-production model

2021 ◽  
Vol 48 (2) ◽  
pp. 301-312
Author(s):  
Muhammad Abdur Rouf ◽  
Sheik Istiak Md Shahriar ◽  
Md Hafizur Rahman ◽  
Md Mehedi Hasan ◽  
Al Hasan Antu ◽  
...  
Keyword(s):  
Fishing Effort ◽  
Mean Value ◽  
Maximum Sustainable Yield ◽  
Production Model ◽  
Error Estimator ◽  
Sustainable Yield ◽  
Observation Error ◽  
Total Allowable Catch ◽  
Surplus Production ◽  
Surplus Production Model

Maximum sustainable yield (MSY), fishing effort (fmsy) and total allowable catch (TAC) of major fishery in the Passur River, Bangladesh were estimated using surplus production model (Schaefer and Fox model) with observation-error estimator based on four years (2011-2014) catch and effort data. Fox model was especially highlighted in this study; the estimated value of MSY was 4.61 kg with corresponding fmsy of 13.51 units (200m2SBN/day). Moreover, the mean value of MSY and TAC with 95% confidence interval in stochastic method was 4.53 kg and 4.08 kg respectively with the 13.22 units of fishing effort (fmsy). The overall results provide clear evidence that the fishery of the Passur River is being overexploited in the months from December to March. Sustainable exploitation of this stock can be assured through reducing present fishing effort. In addition, TAC might be incorporated along with several existing fisheries management measures to ensure the compensation of this stock towards long term sustainability. Bangladesh J. Zool. 48(2): 301-312, 2020

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

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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