本研究基于2016年对南海三省区的14个沿海主要渔港的连续4个季节抽样调查(共计5256航次,抽样总功率达到89.2×10^4 kW),以kg·kW^-1·d^-1作为CPUE(Catch per unit effort,单位捕捞努力量渔获量)标准化后的单位,对南海9种...本研究基于2016年对南海三省区的14个沿海主要渔港的连续4个季节抽样调查(共计5256航次,抽样总功率达到89.2×10^4 kW),以kg·kW^-1·d^-1作为CPUE(Catch per unit effort,单位捕捞努力量渔获量)标准化后的单位,对南海9种捕捞作业类型渔船的CPUE进行了比较分析。结果显示,CPUE围网>CPUE双拖>CPUE刺网>CPUE罩网>CPUE张网>CPUE单拖>CPUE虾拖>CPUE笼壶>CPUE钓具。不同捕捞作业类型CPUE随渔船功率段的变化而不同,CPUE峰值数及其所对应的最优功率段(渔获率最高的功率段)也有差异,单拖和虾拖渔船的CPUE随渔船功率的变化具有1个CPUE峰值点,最优功率段分别为(200~250)kW(CPUE=8.6 kg·kW^-1·d^-1)和(150~200)kW(CPUE=5.0 kg·kW^-1·d^-1);围网、双拖、钓具和刺网渔船的CPUE随渔船功率的变化有2个CPUE峰值点,对应的最优功率段分别为(200~250)kW(CPUE=47.7 kg·kW^-1·d^-1)、(350~400)kW(CPUE=16.8kg·kW^-1·d^-1)、(50~100)(CPUE=2.9kg·kW^-1·d^-1)和(0~50)kW(CPUE=6.9 kg·kW^-1·d^-1)。罩网渔船CPUE随功率段变化有3个峰值点,最优功率段为(0~50)kW(CPUE=7.0kg·kW^-1·d^-1)。不同捕捞作业类型CPUE季节变化表现:围网CPUE均值在春季最高,单拖、双拖、罩网、钓具和笼壶在夏季最高,张网在秋季最高,刺网和虾拖在冬季最高。展开更多
本研究是在阐明传统CPUE(Catch Per Unit Effort)单位表述多样性的基础上,分析传统CPUE存在的不确定性、单位不统一性以及解析与意义不完整等问题。对24个CPUE单位,首先通过通用性标准,筛选出各种捕捞方式均能适用的8个CPUE单位;再通过...本研究是在阐明传统CPUE(Catch Per Unit Effort)单位表述多样性的基础上,分析传统CPUE存在的不确定性、单位不统一性以及解析与意义不完整等问题。对24个CPUE单位,首先通过通用性标准,筛选出各种捕捞方式均能适用的8个CPUE单位;再通过相似性标准,对CPUE单位聚类分成2组,并在每组中筛选出最佳单位为kg/(kW·d)和kg/d;最后通过稳定性筛选标准对其标准差与变异系数值计算,最终得到CPUE的标准单位:kg/(kW·d),并确定CPUE的表达形式。本研究还基于CPUE单位标准化进行了实证分析,对2016年4个季度南海三省区的9种主要作业类型渔船的生产调查数据进行了分析比较,捕捞能力大小依次为:围网>双拖>刺网>罩网>张网>单拖>拖虾>笼壶>钓具。CPUE经单位标准化后已具备进行捕捞产量统计、评估渔船捕捞能力、衡量资源相对丰度指数、评估渔业资源利用水平等功能。展开更多
Specimens belonging to the family Blenniidae were collected in a fishery resource investigation from the coastal waters of Xisha Islands and Hainan Island, South China Sea in 2016. Combining morphological results with...Specimens belonging to the family Blenniidae were collected in a fishery resource investigation from the coastal waters of Xisha Islands and Hainan Island, South China Sea in 2016. Combining morphological results with sequence analysis, we identified one specimen as Xiphasia matsubarai Okada & Suzuki, 1952. This represents a new record in the South China Sea. In morphology, the specimen has the following traits: body elongated, eel-like or ribbon-like in shape; flanks medium flat; the head small bluntly rounded anteriorly and without a moustache; eyes is slightly smaller, on upper lateral position of head, which is about equal to 1/5 of the length of the head; body without scales, lateral line has been degraded; both sides of the upper and lower jaws with a canine; gill is opening at the top of the pectoral fin base, approximately equal to the length of eye diameter. Dorsal fin Ⅺ, 96; pectoral fin 10; anal fin Ⅱ, 95. Head and body grey-brown, including 26 dark grey-brown bands; abdomen and lower operculum yellowish grey and colour lighter; and dorsal base long with dark grey. Origin of dorsal is located over the anterior margin of pupil; black blotch on dorsal fin between 8 th and 10 th dorsal spine; anal and caudal fins dark grey, pectoral and ventral fins pale yellow. Sequence analysis of cytochrome oxidase subunit I gene( COI) strongly supports the identity of the specimen as Ⅹ. matsubarai.展开更多
文摘本研究基于2016年对南海三省区的14个沿海主要渔港的连续4个季节抽样调查(共计5256航次,抽样总功率达到89.2×10^4 kW),以kg·kW^-1·d^-1作为CPUE(Catch per unit effort,单位捕捞努力量渔获量)标准化后的单位,对南海9种捕捞作业类型渔船的CPUE进行了比较分析。结果显示,CPUE围网>CPUE双拖>CPUE刺网>CPUE罩网>CPUE张网>CPUE单拖>CPUE虾拖>CPUE笼壶>CPUE钓具。不同捕捞作业类型CPUE随渔船功率段的变化而不同,CPUE峰值数及其所对应的最优功率段(渔获率最高的功率段)也有差异,单拖和虾拖渔船的CPUE随渔船功率的变化具有1个CPUE峰值点,最优功率段分别为(200~250)kW(CPUE=8.6 kg·kW^-1·d^-1)和(150~200)kW(CPUE=5.0 kg·kW^-1·d^-1);围网、双拖、钓具和刺网渔船的CPUE随渔船功率的变化有2个CPUE峰值点,对应的最优功率段分别为(200~250)kW(CPUE=47.7 kg·kW^-1·d^-1)、(350~400)kW(CPUE=16.8kg·kW^-1·d^-1)、(50~100)(CPUE=2.9kg·kW^-1·d^-1)和(0~50)kW(CPUE=6.9 kg·kW^-1·d^-1)。罩网渔船CPUE随功率段变化有3个峰值点,最优功率段为(0~50)kW(CPUE=7.0kg·kW^-1·d^-1)。不同捕捞作业类型CPUE季节变化表现:围网CPUE均值在春季最高,单拖、双拖、罩网、钓具和笼壶在夏季最高,张网在秋季最高,刺网和虾拖在冬季最高。
文摘本研究是在阐明传统CPUE(Catch Per Unit Effort)单位表述多样性的基础上,分析传统CPUE存在的不确定性、单位不统一性以及解析与意义不完整等问题。对24个CPUE单位,首先通过通用性标准,筛选出各种捕捞方式均能适用的8个CPUE单位;再通过相似性标准,对CPUE单位聚类分成2组,并在每组中筛选出最佳单位为kg/(kW·d)和kg/d;最后通过稳定性筛选标准对其标准差与变异系数值计算,最终得到CPUE的标准单位:kg/(kW·d),并确定CPUE的表达形式。本研究还基于CPUE单位标准化进行了实证分析,对2016年4个季度南海三省区的9种主要作业类型渔船的生产调查数据进行了分析比较,捕捞能力大小依次为:围网>双拖>刺网>罩网>张网>单拖>拖虾>笼壶>钓具。CPUE经单位标准化后已具备进行捕捞产量统计、评估渔船捕捞能力、衡量资源相对丰度指数、评估渔业资源利用水平等功能。
基金Supported by the National Natural Science Foundation of China(No.41376158)the Far Sea Fisheries Resources Monitoring and Assessment of South China Sea(No.2013050212)
文摘Specimens belonging to the family Blenniidae were collected in a fishery resource investigation from the coastal waters of Xisha Islands and Hainan Island, South China Sea in 2016. Combining morphological results with sequence analysis, we identified one specimen as Xiphasia matsubarai Okada & Suzuki, 1952. This represents a new record in the South China Sea. In morphology, the specimen has the following traits: body elongated, eel-like or ribbon-like in shape; flanks medium flat; the head small bluntly rounded anteriorly and without a moustache; eyes is slightly smaller, on upper lateral position of head, which is about equal to 1/5 of the length of the head; body without scales, lateral line has been degraded; both sides of the upper and lower jaws with a canine; gill is opening at the top of the pectoral fin base, approximately equal to the length of eye diameter. Dorsal fin Ⅺ, 96; pectoral fin 10; anal fin Ⅱ, 95. Head and body grey-brown, including 26 dark grey-brown bands; abdomen and lower operculum yellowish grey and colour lighter; and dorsal base long with dark grey. Origin of dorsal is located over the anterior margin of pupil; black blotch on dorsal fin between 8 th and 10 th dorsal spine; anal and caudal fins dark grey, pectoral and ventral fins pale yellow. Sequence analysis of cytochrome oxidase subunit I gene( COI) strongly supports the identity of the specimen as Ⅹ. matsubarai.
