大长山岛海域许氏平鲉生长特征和资源动态分析
Growth characteristics and resource dynamics of rockfish(Sebastes schlegelii)in waters of Dachangshan Island
崔久儒 1薛国进 2尹增强 3杨济淞 1李国星 3孙珮琦 1田涛 2程前 4刘永虎4
作者信息
- 1. 大连海洋大学 海洋科技与环境学院,辽宁 大连 116023;大连海洋大学 水产与生命学院,辽宁 大连 116023
- 2. 大连海洋大学 水产与生命学院,辽宁 大连 116023
- 3. 大连海洋大学 海洋科技与环境学院,辽宁 大连 116023
- 4. 大连现代海洋牧场研究院,辽宁 大连 116087
- 折叠
摘要
为了解黄海北部大长山岛海域许氏平鲉(Sebastes schlegelii)的资源动态,确定资源可持续利用策略,根据 2011-2019 年大长山岛海域现场调查数据,分析了许氏平鲉体长与体质量的关系,建立了体长生长和体质量生长方程,评估了大长山海域该种类的资源量,模拟分析了不同管理策略下许氏平鲉的单位补充量怀卵量(Egg Production per Recruitment,EPR)与单位补充量产卵亲体生物量(Spawning Biomass per Recruitment,SBR)的变化.结果表明:大长山岛海域许氏平鲉的体长体质量关系式为 W=4×10-5 L2.934 4(R2=0.918 9),渐进体长L∞=425 mm,渐进体质量W∞=2 064.5 g,生长参数K=0.23 a-1,t0=-0.58 a,体质量生长的拐点年龄为 4.1 a;资源群体的总死亡系数、自然死亡系数和捕捞死亡系数分别为 1.34、0.208 9 和 1.311 1 a-1,临界年龄为 5.7 a,资源生物量为 1 084.68 t;休渔期设为 3-5 月较合理,此时EPR值将恢复到 67.54%、SBR值为 85.35%.研究表明,大长山岛海域许氏平鲉资源处于过度捕捞状态,群体低龄化明显,产卵亲体的产卵量严重不足,亟需进行科学管理.
Abstract
To understand the population dynamics of rockfish(Sebastes schlegelii)and determine the strategy of sustainable utilization,based on the surveyed data from 2011 to 2019 in Dachangshan Island waters,the relationship between body length and body weight was analyzed,the body length growth equation and body weight growth equa-tion were established,and the resources of this species were evaluated in Dachangshan Island waters.The changes in eggs production per recruitment(EPR)and spawner biomass per recruition(SBR)of Sebastes schlegelii were simulatively analyzed under different management strategies.The results showed that the length-weight formula was described as W=4×10-5L2.934 4(R2=0.918 9,n=204).There were asymptotic body length(L∞)of 425 mm,the as-ymptotic body weight(W∞)of 2 064.5 g,growth curvature K of 0.23 a-1 and the theoretical initial age t0 of-0.58 a,and the inflection age of body weight growth of 4.1 a,with the total mortality(Z)of 1.34 a-1,the natural mortal-ity(M)of 0.208 9 a-1 and the fishing mortality(F)of 1.311 1 a-1.The critical age was found to be 5.7 a,and the biomass to be 1 084.68 t.It would be more reasonable to set the closed fishing period from March to May,when EPR values return to 67.54%and SBR values to 85.35%during the unfished period.It is found that the resources of S.schlegelii are overfished,the population is seriously juvenile,and the spawner biomass is seriously insufficient in waters of Dachangshan Island,with urgent need of scientific management.The findings are expected to provide a reference for the rational use of population of S.schlegelii in Dachangshan Island.
关键词
许氏平鲉/生长特征/资源状态/评估/大长山岛Key words
Sebastes schlegelii/growth characteristics/population status/evaluation/Dachangshan Island引用本文复制引用
基金项目
国家重点研发计划(2019YFD0901302)
大连市科技创新基金项目(2021JJ11CG001)
出版年
2024
NETL
NSTL
万方数据