关键词:
growth
mortality
length at median sexual maturity
fishing pressure
phenotypic plasticity
摘要:
Long-term variations in population structure,growth,mortality,length at median sexual maturity,and exploitation rate of threadfin bream(Nemipterus virgatus)are reported based on bottom trawl survey data collected during 1960-2012 in the Beibu Gulf,South China ***-based analyses were conducted on 16791 individuals collected quarterly in eight different sampling *** body length,estimated asymptotic length,and percentage of large individuals have decreased significantly with the growth of marine catch and fishing power,indicating individual miniaturization of this fish *** exploitation rates indicate that the *** stock in the Beibu Gulf was moderately exploited in 1960 and 1962 and overexploited after *** stock was taking a good turn in status in 2012,with the lowest exploitation rate since 1992 and ceased downward trend in length *** results suggest that management measures to reduce fishing pressure may have a positive influence on the biological characteristics of this commercial fish *** characteristics of most commercial fish species have phenotypic plasticity and might change over years in response to fisheries ***,attentions should be paid on variations in fish biological characteristics,when evaluating the effectiveness of current measures to control the total catch for all fisheries.