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1.
厦门海域渔业资料评估 总被引：4，自引：0，他引：4
以初级生产力和渔业统计资料为材,分别应用Ｔａｉｔ沿岸海域生态系统能流分析法、营养动态法和Ｃｕｓｈｉｎｇ等３种模式,枯算厦门沿岸海域的渔业资料自然生产量。同时,分别应用Ｓｃｈａｅｆｅｒ和Ｆｏｘ两种剩余产量模式估算最大持续产量和最大持续捕捞力量。前３种模式估算该海域的资源生产量分别为２０１０５t,１８４６３t和１７４８９t, 平均１８６８６t。后两种模式估算最大持续产量平均值分别为９６３９t和９１０４t。估 相似文献
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厦门同安湾、西海域渔业管理目标的比较 总被引：3，自引：0，他引：3
应用Schaefer和Fox剩余产量模型及其由此衍生的生物经济模型和Gulland最适产量Y0.1模型,分别估算了厦门同安湾和西海域的最大持续产量、最大持续捕捞力量、最适产量、最适捕捞力量、最大经济产量、最大经济捕捞力量、最大经济效益,并对各模型计算的诸项经济指标进行比较,建立了3种模式渔业管理.根据厦门同安湾、西海域渔业实际情况和渔业发展趋势,提出了3种管理目标的实施步骤,并结合厦门市建设海湾型城市规划从经济学角度利用行政手段对西部海域、同安湾海域的管理进行初步探讨. 相似文献
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以海洋生态系营养动力学为基础 ,采用Steele模式估算闽南 台湾浅滩渔场中上层鱼类资源年生产量为 86 4.6 3kt,进而以鲐鱼参鱼类群聚资源在中上层鱼类资源的比例 ,估算鲐鱼参鱼类群聚资源的年生产量为 5 1 9.5 6kt。Gulland和MSY简单模式估算鲐鱼参鱼类群聚资源的最大持续产量分别为 2 5 0 .5 7kt和 2 5 9.78kt。Schae fer和Fox剩余产量模式估算鲐鱼参鱼类群聚资源的最大持续产量分别 2 36 .0kt和2 34.1kt,最大持续捕捞力量分别为 1 1 40 4.1和 1 2 6 6 6 .6MW·d ,折算为福建灯光围网渔船分别为 42 4和 471组 ,并从开发现状和种群生态学及捕捞死亡等参数分析鲐鱼参鱼类群聚资源的开发前景。 相似文献
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应用非平衡产量模型对卡塔尔渔业的分析 总被引：1，自引：1，他引：1
剩余产量模型是鱼类种群动力学的主要模型之一。本文应用 1个非平衡产量模型分析了卡塔尔渔业。结果表明当前鱼类生物量是最大持续产量时生物量的 1/4,当前捕捞死亡率是最大持续产量时捕捞死亡率的 2倍。经估算最大持续产量是 782 6t( 80 %置信区间为 6767～ 7993t) ,最佳捕捞努力量是 2 4 8艘船 ( 80 %置信区间为 2 2 5～ 2 86艘 )。 相似文献
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厦门沿岸海域渔业资源变化和最适捕捞力量的估算 总被引：4，自引：0，他引：4
本文以厦门沿岸海域历次渔业资源和生物调查及１９８４－１９９５年渔业统计资料为背景,分析了该海域渔业资源的变动,重点对文昌鱼、真鲷、鳓鱼、大黄鱼、蓝点斑马鲛、长毛对、中国鲎等重要经济种类资源变动的原因进行探讨,针对目前资源的变动趋向,指出了近期重点的保护对象和有开发潜力的种类,并以三种标准捕捞力量,应用了Ｓｃｈａｅｆｅｒ和Ｆｏｘ两种剩余产量模式估算最大持续产量（ＭＳＹ）和最知捕捞力量。估算结果ＭＳＹ 相似文献
6.
闽南-台湾浅滩海域鱼类资源生产量 总被引：8，自引：0，他引：8
以海洋生态系统营养动力学为理论依据,根据调查所获得的有关闽南-台湾浅滩海域的初级生产力资料,检测了该海域的浮游植物有机碳含量,测算了生态效率,检测了52种主要经济鱼类营养级及其有机碳含量.采用营养动态模型和Cushing模型估算了该海域生态系统中鱼类资源的生产量(自然生产量),同时采用Cadima模式和MSY简单模式估算鱼类资源最大可持续开发量.估算结果如下鱼类资源生产量为98.63×104t,最大可持续开发量为 48.35×104t.1997年以来实际年渔获量为48.64×104t -53.83×104t,超过了鱼类资源的最大可持续开发量,呈现过度捕捞态势.还讨论了加强该渔场渔业资源管理的7项重要措施,以促进鱼类资源的较快恢复. 相似文献
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闽南-台湾浅滩海域生态系统渔业资源容纳量 总被引：4，自引：0，他引：4
以在台湾海峡及其邻近海域开展的海洋科学调查研究所获得的有关闽南-台湾浅滩海域的初级生产力为基础,通过对渔业资源种类组成和结构的调查、浮游植物有机碳含量,鱼类、虾类、蟹类、头足类等主要种的营养级及其有机碳含量检测和生态效率的测算,采用营养动态模型和Cushing模型估算该海域渔业资源容纳量(自然生产量).同时,采用Gulland模式和MSY简单模式估算渔业资源最大可持续开发量.结果表明该海域渔业资源容纳量为125.23×10~4t,最大可持续开发量为61.92×10~4t.1996年以来实际年渔获量在62.05×10~4～67.29×10~4t,平均64.74×10~4t,超过了渔业资源的剩余产量,呈现过度捕捞态势. 相似文献
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《中国海洋大学学报(自然科学版)》2020,(Z1)
优化渔业监测方案,利用有限调查成本获取可靠的渔业数据,对于海洋捕捞产量抽样调查、掌握渔业资源动态变化具有重要意义。本文根据2017年山东省海洋捕捞渔业信息船的渔捞日志数据,以8种重要渔业物种为目标物种,将这些物种的单位渔船年捕捞产量和单位渔船年总捕捞产量的估计值为渔业生产监测目标,进行计算机模拟,以相对估计误差(REE)、相对偏差(RB)作为评价指标,研究了渔业生产监测信息船数量对渔业生产监测目标估计的影响。研究表明,对于各物种的单位渔船年捕捞产量,估计值的相对估计误差和相对偏差的绝对值均随着渔业信息船数的减少不断增大,渔业信息船数少于130时,各指标的变化幅度较大。当渔业信息船数量由210减少至130时,即渔业信息船数降低近38%,所选指标的REE值增加约8%,RB绝对值平均增加0.17%。研究结果表明,海洋捕捞产量抽样调查的渔业信息船数在保证监测目标估计值一定准确度、精确度的情况下可进行优化,130可视为2017年山东海洋捕捞生产监测可接受的最优渔业信息船的数量。 相似文献
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限额捕捞试点工作逐步展开,预示着我国海洋渔业管理进入全面有序的管理时代。文章根据2008—2017年南海北部渔港渔业生产抽样调查数据,统计出南海北部金线鱼的产量主要来自刺网,占累计总产量的72.90%。剩余产量模型分析认为南海北部金线鱼的最大可持续产量在168 632.99~31 0518.85 t,平均为251 765.59 t。2017年实施最严格的休渔制度后,当年的捕捞努力量投入和渔业产量均未超过最适值,当前总可捕量可设为158 515 t。文章研究结果可为该鱼种限额捕捞政策实施提供参考。 相似文献
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福建近海五种主要捕捞作业适宜捕捞力量的研究 总被引：1，自引：0，他引：1
本文根据福建省定置、拖、围、刺、钓五种捕捞作业在本省近海的捕捞力量和渔获量,并以１９９４年单位功率的渔捞效率为基准进行逐年捕捞力量的标准化,应用Ｓｃｈａｅｆｅｒ和Ｆｏｘ两同电脑分别估算它们的ｆＭＳＹ和ＭＳＹ。结果两处在算的ｆＭＳＹ和ＭＳＹ的平均值是：定置网为８．９０尤明等３７．４１万ｔ;推网为５５．８８万ＫＷ,３５．５１万ｔ;为桃围网为７．１２万ＫＷ,１０．０６万ｔ;刺网为１５．１９万ＫＷ,９．５ 相似文献
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《Marine Policy》2017
The Shark Bay trawl fishery is Western Australia's most valuable prawn fishery (worth AUD$25 million in 2014). The 18-vessel fleet targets western king prawns (Penaeus latisulcatus), brown tiger prawns (P. esculentus) and also retains saucer scallops (Ylistrum balloti) and blue swimmer crabs (Portunus armatus). Increased fuel prices, falling prawn prices and lower catches of other species, following extreme environmental events, have impacted fishery profits. A biomass dynamics model with an economic component indicated that total revenue levels start to decline when annual effort increases beyond ~ 200 fishing days per boat. Annual effort required to achieve MEY, when based solely on prawn fishing, is 115–150 days per boat after accounting for fixed and variable fishing costs and annual fishing efficiency increases of 1–2%. From 2007–2014, the adjusted effort was 188–192 days per boat. Fishing occurred between March and November during 7–8 fishing periods, separated by 5–8 day (low catchability) moon closure periods. An empirical daily profit assessment (2007–2015), accounting for recruitment variation, daily prawn size compositions, monthly market prices for different prawn species and sizes, and daily fishing costs, showed vessels made profits on ~ 115–160 days and losses on ~ 15–55 days per year, when fishing occurred near the full moon. The fishery benefitted in 2013–2015 by starting later in the year and better targeting within-season effort. This management strategy within the effort-control framework, which improved profitability, maintained higher spawning stocks and reduced ecosystem fishing impacts, has wider application in prawn fishery management. 相似文献
15.
Bernerd Fulanda Jun OhtomiElizabeth Mueni Edward Kimani 《Ocean & Coastal Management》2011,54(5):401-414
The present study assessed trends in resource-use, partitioning and management in the Ungwana Bay fishery, Kenya, using surplus production models. The fishery is one of East Africa’s important marine fisheries sustaining a bottom trawl commercial fishery and a resident-migrant artisanal fishery. Two models: Schaefer (1954) and Gulland and Fox (1975) were applied to catch-effort data over a 21-year period to model maximum sustainable yield (MSY) and optimal effort (fMSY) to examine the status of resource exploitation and provide reference points for sustainable management. In the artisanal fishery, model MSYs range from 392-446 t to 1283-1473 t for shrimps and fish respectively compared to mean annual landings of 60 t for shrimp and 758 t for fish. These landings represent <50% of the model MSYs suggesting under exploitation in the sub-sector. Moreover, current fishing effort applied stands at <0.5 fMSY. On the other hand, mean annual landings in bottom trawl commercial fishery, at about 330 t for shrimps and 583 t and fish represent about 90% of the model MSYs of 352-391 t and 499-602 t for shrimps and fish respectively. Therefore, the bottom trawl commercial fishery is likely under full exploitation. Similarly, the current effort is estimated at >0.7 fMSY. Resource management in the bay is faced with numerous problems including resource-use conflicts, poor economic conditions in artisanal fishery, poor legislation, and inadequate research augmented by poor reporting systems for catch-effort statistics. Thus, the fishery lacks clearly defined exploitation regimes. Fisheries research and assessment of the marine resources are important for sustainability of the fishery. Moreover, income diversification in the poverty ridden artisanal fishery would go a long way in addressing resource-use conflicts and use of deleterious fishing methods in the sub-sector. Borrowing from the successes of the Japanese community-based fisheries resource management (CBFRM) which has easily resolved numerous fisheries management issues in coastal small-scale commercial fisheries, and the beach management unit (BMU) system which has been applied to the artisanal fisheries of south coast Kenya with enormous benefits, it is envisaged that a hybrid CBFRM-BMU system presents the best approach to sustainable resource-use in the Ungwana Bay fishery. 相似文献
16.
山东省海洋渔业结构调整研究 总被引：1，自引：0，他引：1
在对山东省海洋渔业现状进行了全面调查、研究与分析的基础上,用灰色模型理论,模拟预测山东省渔业发展的特性与趋势;运用平衡产量和经济模型分别评估了山东省海洋捕捞的最高持续渔产量与最大持续经济产量及其相应努力量;运用线性规划的理论与方法,测算了各档次渔船的功率和船只匹配的优化估算值。依据该数值模型所作的评估结果,提出了对山东海洋渔业结构的调整意见。 相似文献
17.
基于北斗船位数据的渔业信息解译与应用研究——以中国毛虾限额捕捞管理为例 总被引：1，自引：0，他引：1
2020年6月15日—7月15日,我国首次中国毛虾(Acetes chinensis)限额捕捞试点于江苏连云港实施。本研究提取62艘毛虾网船在限额捕捞期间的421700条北斗船位数据经纬度、航速、航向等信息,运用缓冲区叠加分析法、DBSCAN密度聚类算法、平均中心算法、核密度估计以及数据库查询对捕捞努力量等管控要素进行分析研究。结果显示,所有毛虾网船累计作业239个航次、1942个网次,捕捞过程分为航行、抛锚布网、等待渔获、收渔获、停航等5个状态,中国毛虾捕捞状态船位点呈直线分布,总捕捞时长为4413.73h,82.4%的单网次捕捞时长为1.5—3.5h,各网次捕捞产量呈现多核心空间分布模式,总捕捞努力量为108106343 m~2·h,计算62艘的捕捞总产量值约为2328 t,比上报产量高12.6%;本文通过北斗船位数据解译和提取捕捞努力量以计算中国毛虾捕捞产量及资源空间分布情况,有效应用于中国毛虾限额捕捞,为解决我国单品种限额捕捞难点积累了宝贵经验。 相似文献
18.
《Marine Policy》2013
The western rock lobster (Panulirus cygnus) fishery has been facing significant economic pressure from increasing costs, lower prices as well as predicted reduced catches due to low recruitment. A maximum economic yield (MEY) assessment estimated the fishing effort that would maximise the net present value of profits over 2008/09–2013/14 was about 50%–70% reduction of 2007/08 effort. The assessment accounted for fixed vessel costs and the variable pot lift cost. An important component of this assessment was the use of puerulus settlement time series that provided a reliable predictor of recruitment to the fishery 3–4 years later. This can be contrasted to most MEY assessments that would use an average catch-effort relationship rather than taking into account the expected recruitment. This predictive ability has been particularly useful as there has been a period of unusually low puerulus settlements over the 5 years (2006/07–2010/11) including the lowest two settlements in the 40-year time series. Due to the low settlements, substantial management changes were implemented in 2008/09 and 2009/10 (44% and 73% reduction in nominal fishing effort, respectively compared to 2007/08) to maintain the breeding stock at sustainable levels by having a significant carryover of legal lobsters into future years of lower recruitment. These effort reductions provided a unique opportunity to assess the economic impact of a fishery moving to an MEY effort level over two years. The CPUE increased from 1.1 kg/pot lift in 2007/08 to 1.7 and 2.7 in 2008/09 and 2009/10, respectively. These CPUEs were much higher than the expected levels (1.2 and 1.1, respectively) if the 2007/08 effort had been maintained in these two years. The vessel numbers declined by 14% and 36% in 2008/09 and 2009/10, respectively, compared to 2007/08. The fishery profit increased by AUS$13 and 49 million for 2008/09 and 2009/10, respectively, compared to that estimated if the 2007/08 effort level had continued. This assessment demonstrates the economic benefits of fishing at a level close to that estimated for MEY under an input management regime. The management decision-rule framework is currently based on having the egg production above a threshold reference level to ensure sustainability and now a target reference point based on MEY principles is also being considered. 相似文献