摘要
本文以2003—2004年闽南．台湾浅滩渔场二长棘鲷周年12个月的生物学测定资料，研究其群体结构现状和生长与死亡参数，并与此前的研究结果比较，探讨二长棘鲷的种群动态变化趋势．结果表明：2004年渔获群体平均叉长和平均年龄都较1976、1994和2000年小，L∞和W∞较1982、1994年小，体重生长速率k较1982、1994年大，拐点较1982、2000年提前．雌、雄性初次性成熟的叉长较1976和1994年小，显示渔获个体小型化、低龄化和早熟化，体重生长速率加大，生长拐点提前的变化．这些变化正是二长棘鲷对强大的捕捞压力和环境变化所采取的生态对策，反映了当前二长棘鲷的生态仍较脆弱，资源形势仍较严峻，1994年以来二长棘鲷捕捞死亡系数居高不下，开发比率超过0．5．底拖网渔业的渔获量应控制在估算的最大可持续开发量26．94×10^4t（其中二长棘鲷2．30×10^4t），最大持续捕捞力量2180艘福建标准单拖渔船．最小开捕规格为94．6mm和25．76g．只有强化管理，资源才能得到明显恢复．
Based on the biological data of Parargyrops edita in Minnan-Taiwan Bank fishing grounds in period from 2003 to 2004, this paper studied the status of population structure, parameters of growth and mortality. Comparing with previous studies on P. edita, we discussed the variation tendency in population dynamic of P. edita. The resuits showed that, the average fork length and average age in 2004 were less than in 1976, 1994 and 2000, utmost length and utmost body weight were smaller than in 1982 and 1994, the growth rate of body weight was higher than in 1982 and 1994, the inflexion point on the body weight was lower than in 1982 and 2000. The fork length of the first maturity was shorter than in 1976 and 1994. Compared with the population structure of stocks from the past years, it is evident that the adults were premature in fast growth while they became smaller and younger and the in- flexion of weight was ahead of the schedule. These changes were the bionomic strategy for P. edita responding the heavy catching pressure and environment changes. It showed that the ecology was fragile, and the status of resources seemed in a state of overexploitation and in high intensive utilization. The fishing mortality coefficient was higher and higher since 1994, exploitation rate was higher than 0. 5, the maximum sustained yield（MSY） of fishery resources in trawl boats was calculated to be 26. 94 × 10^4t （ P. edita was 2. 30× 10^4t ）, the maximum sustained yield was calculated to be 2 180 standard trawl boats in 94.6mm and 25.76g. Therefore, based on the caught Fujian. The minimum capture fork length and weight were composition, stock status and growth characteristics, it is suggested that the young should be well protected and managed with reasonably utilized.
出处
《台湾海峡》
CAS
CSCD
北大核心
2008年第2期190-196,共7页
Journal of Oceanography In Taiwan Strait
基金
福建省海洋与渔业局资助项目(闽海渔科2001-06)和海洋生物多样性(2004)
关键词
二长棘鲷
种群结构
生长
死亡
参数变化
种群变动趋势
台湾海峡南部
Parargyrops edita
population structure
growth
mortality
parameter variation
population dynamics tendency
southern Taiwan Strait
