基于贴现率的西北太平洋柔鱼生物经济模型及管理策略分析   总被引：1，自引：0，他引：1  

刘金立  陈新军  李纲 《中国海洋大学学报(自然科学版)》2014,44(4):42-46

西北太平洋柔鱼是我国远洋渔业重要的捕捞对象,综合考虑生物、经济和社会效益来科学制定渔业管理目标是确保柔鱼资源可持续利用的重要研究内容。本文根据1996—2011年我国鱿钓船在西北太平洋海域捕捞的柔鱼渔获量和作业成本,结合贴现率和渔获物价格等经济数据,构建基于贴现率的西北太平洋柔鱼生物经济模型。结果表明,西北太平洋柔鱼资源状况处于良好状态,并未遭受过度捕捞;当贴现率α在0.3~0.5之间,当前利益占长远利益的20%~30%(D=0.2~0.3),且渔获物价格在9 195~12 500元/t之间时,该海域的柔鱼资源种群资源量相对稳定,能达到最优种群数量水平,可保证柔鱼渔获量始终处在MSY之下,确保柔鱼资源的可持续利用。  相似文献   

Fishery biology of jumbo flying squid Dosidicus gigas off Costa Rica Dome   总被引：1，自引：0，他引：1  

Xinjun Chen  Jianghua Li  Bilin Liu  Gang Li  Huajie Lu 《中国海洋大学学报(英文版)》2014,13(3):485-490

The jumbo flying squid(Dosidicus gigas) population was surveyed with the help of Chinese squid jigging vessels off the Costa Rica Dome(4°–11°N, 90°–100°W) in 2009 and 2010. The daily catch of D. gigas in the two survey cruises ranged from 0 to 5.5 t and was mostly obtained from the areas bounded by 6°–9°N and 91°–94°W and by 6°30′–7°30′N and 96°–97°W. The sea surface temperature in the areas yielding the most catch ranged from 27.5 to 29℃. The sex ratio of the total catch was 3.75:1(female: male). The mantle length of the squid ranged from 211 to 355 mm(male) and from 204 to 429 mm(female) with an average of 297.9 and 306.7 mm, respectively. In the relationship of the mantle length(mm) and body weight(g) of the squid, there was no significant difference between sexes. The female and male were at a similar maturity, and most individuals are maturing or have matured with a few females being spent. The size(mantle length) and age at the first sexual maturity were 297 mm and 195 d in females, and less than 211 mm and 130 d in males, respectively. Most of the sampled stomachs(70.6%) had no food remains. The major preys of the squids were fish, cephalopods and crustaceans, with the most abundant Myctophum orientale and D. gigas. The preys in more than 65% of the non-empty sampled stomachs evidenced the cannibalism of D. gigas. The results improved current understanding of the fishery biology of D. gigas off the Costa Rica Dome, which may facilitate the assessment and management of relative fishery resources.  相似文献   

基于频度统计和神经网络的北太平洋柔鱼渔场预报模型比较   总被引：1，自引：0，他引：1  

汪金涛  ;陈新军  ;雷林  ;高峰  ;官文江 《广东海洋大学学报》2014,(3):82-87

利用2004~2010年北太平洋鱿钓船队生产数据和海洋环境数据,以海表温度(SST)1℃、海面高度(SSH)为1 cm、叶绿素a浓度(CHL-a)为0.1 mg/m3的间距,分析作业产量、CPUE与SST、SSH、CHL-a的关系,得到柔鱼渔场适宜环境因子范围,并将生产数据和环境数据匹配组成样本集,建立北太平洋柔鱼空间分布BP神经网络模型;利用2011年环境数据预报柔鱼渔场,并与2011年实际生产数据进行对比。结果表明,6~10月各月实际作业位置落入基于频度统计方法预报渔场的概率达90%以上;而BP模型预报的平均精度为79.2%,最低精度为52.5%。基于多环境因子的频度统计柔鱼渔场预报模型优于神经网络模型。  相似文献   

基于绿色发展的我国近海渔业可持续性战略思考          下载免费PDF全文

龙进霞  陈佳怡  徐汉祥  徐开达  朱文斌  梁君 《海洋开发与管理》2021,38(11):11-17

近海渔业的可持续发展对我国渔业经济增长十分重要。文章在对2000—2019年近海渔业资源和水域环境现状分析的基础上,剖析近海渔业存在的问题,如海水养殖资源浪费严重、海洋捕捞过度、渔业专业人才流失和水域环境污染严重等问题。提出基于绿色发展理念的近海渔业从传统产业型向业态创新型转变、资源掠夺型向资源养护型转变和单一生产型向产业链型转变的建议,以期为我国近海渔业的可持续发展提供参考。  相似文献   

山东省海洋渔业结构调整研究   总被引：1，自引：0，他引：1  

高清廉  邱天霞  宋协法  焦志刚  周玉光  季万方  辛荣民 《中国海洋大学学报(自然科学版)》1999,(2)

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   

Calculation of väisalä‐brunt frequencies and specific volume distributions of sea water     

A. E. Gilmour 《新西兰海洋与淡水研究杂志》2013,47(3):217-222

An expression is derived for the Vaisala‐Brunt frequency in terms of the gradients of potential temperature and salinity. Modifications to facilitate calculations are suggested. A new method for expressing the specific volume distribution in terms of pressure, potential temperature, and salinity is also discussed.  相似文献   

Preliminary description of a new species of Paraw aldeckia (Crustacea Amphipoda: Lysianassidae) from New Zealand (note)     

D. E. Hurley  R. Cooper 《新西兰海洋与淡水研究杂志》2013,47(3):563-567

A preliminary diagnosis is given for Parawaldeckia stephenseni from New Zealand, and the genus is briefly reviewed.  相似文献   

Long‐term trends in the recreational lobster fishery of Florida,United States: Landings,effort, and implications for management     

William C. Sharp  Rodney D. Bertelsen  Vernon R. Leeworthy 《新西兰海洋与淡水研究杂志》2013,47(3):733-747

In Florida, United States, the Caribbean spiny lobster, Panulirus argus, supports an important commercial fishery and also perhaps the most intensive recreational fishery of any lobster species, with sales of recreational lobster fishing permits exceeding 100 000 annually. For the past decade, we have used mail surveys of recreational lobster license holders to estimate spatially explicit landings and fishing effort when recreational fishers are most active—during the state's “Special Two‐Day Sport Season”, which takes place just before the opening of the commercial season, and during the first month of the regular recreational season, which coincides with the commercial season. From 1993 through 2002, fishing effort during the Special Two‐Day Sport Season has ranged from 60 000 to 112 000 person‐days, and landings have ranged from c. 112 to 255t. Both fishing effort and landings have varied without trend. Fishing effort during the regular season over the same period has ranged from 261 000 to 514 000 person‐days, and landings have ranged from 434 to 825 t. Fishing effort has shown a marginally statistically significant decreasing trend, the result of a progressive decrease in effort since 1999. The largest proportion of both fishing effort and landings was concentrated along the south‐east coast. Despite the recent decrease in landings, the proportion of total landings made by the recreational fishery has increased. From 1993 through 1998, the fishery was responsible for c. 30% of commercial landings; by 2001, that percentage increased to nearly 40%. Such a shift in landings away from the commercial trap fishery toward the recreational fishery was recognised as a potential but unintended effect of the ongoing management plan of restricting effort in the commercial trap fishery. Our 2001 surveys revealed that recreational lobster fishers spent more on a person‐day basis than the general visitor to the Florida Keys did, but less than those visitors using the region's coral reefs. Consequently, managers must establish management strategies that allow the coexistence of this resource's user groups and also incorporate the social and environmental concerns of nonuser groups.  相似文献   

Tag loss and movement of stocked yearling rainbow trout (Oncorhynchus mykiss) in southwestern Australia     

BW Molony  AR Church  T Cabassi 《新西兰海洋与淡水研究杂志》2013,47(1):60-69

Rainbow trout, Oncorhynchus mykiss, have been stocked in southwestern Australia since the 1930s. Trials at a research station maintained 868 tagged yearling O. mykiss (age: 14 months; standard length: 208 mm) for up to 375 days. The mean tag loss rate was 0.12% ± 0.040% per day for both single- and double-tagged fish. The tag loss rate was used to interpret tag return data from 7030 single-tagged yearlings stocked into three river systems in southwestern Australia. Recaptures indicated that O. mykiss survived into their second season in all rivers, with the maximum time at liberty of 21 months (longevity of at least 35 months). Upstream and downstream movements of O. mykiss increased with time, although 29% of recaptures were reported from the stocking site. Significantly more O. mykiss were recaptured from the Warren River, and differences remained even when corrected for stocking levels; angler effort had a marginal effect on return rates. Higher return rates from the Warren River may be due to availability of suitable habitat (stream cover, cooler water) for O. mykiss. Results allow the stocking regime to be reviewed to improve fishery performance.  相似文献   

基于Pocket PC 的海洋渔业调查数据采集   总被引：1，自引：0，他引：1  

李阳东  陈新军  朱国平  韩震 《海洋科学》2013,37(4):65-69

针对传统的主要依赖于纸质日志记录海洋渔业资源调查数据所存在的数据质量差、难以保存、作业效率低等弊端,结合Pocket PC移动终端的优越性,提出利用Pocket PC平台记录海洋渔业资源调查数据,并分别就近海调查和远洋调查数据采集提出了相应的基于 Pocket PC 平台的信息化数据采集解决方案。然后以大洋性鱿鱼资源调查为例,设计并开发了一个基于Pocket PC的海洋渔业调查数据采集系统。通过实践检验,该系统可较好地完成大洋性鱿鱼资源调查的数据采集任务,同时也表明了基于 Pocket PC的海洋渔业调查数据采集的可行性和优越性。讨论的数据采集解决方案和相关技术可为海洋渔业和海洋环境相关的调查数据采集提供信息化支持。  相似文献