摘要
根据2007-2008年智利外海茎柔鱼资源调查期间采集的样本,以耳石最大宽度MW与其总长TSL之比作为表征耳石生长的指标,利用方差分析研究性成熟和个体大小对耳石生长的影响。分析认为,雌性个体的耳石MW/TSL与性腺成熟度存在相关性,性成熟度Ⅰ级与Ⅲ级、Ⅱ级与Ⅲ级个体的耳石MW/TSL存在显著差异(P<0.05);而雄性个体的耳石MW/TSL与性腺成熟度无关。雌性个体的耳石MW/TSL与胴长也存在着相关性,胴长300～400mm的个体与500～600mm和600～700mm、胴长400～500mm与500～600mm和600-700mm的雌性个体,它们耳石MW/TSL差异显著(P<0.05),胴长为400～500mm至500～600mm的个体,其MW/TSL增加迅速,差异极显著(P<0.01)。胴长350～400mm与400～500mm、400～450mm与450～500mm的雄性个体,它们耳石MW/TSL也存在显著差异(P<0.05),胴长400～450mm时的MW/TSL值为最小。研究表明,性成熟和个体大小对智利外海茎柔鱼耳石的生长有影响,但雌雄个体有差别。
According to the samples of Dosidicus gigas collected by Chinese squid jigging vessels during the investigation from 2007 to 2008 off the coast of Chile,the ratio of statolith maximum width（MW） to total length（TSL） as an indicator of statolith growth,the statolith growth impacted by sex maturity and individual size is analyzed by the analysis of variance.The results indicated that the ratio of MW to TSL（MW/TSL） for female individual is closely related with gonad maturity,for the female squids with sexual maturity stage Ⅰ to stage Ⅲ,stage Ⅱ to stage Ⅲ,there was a significant difference between their MW/TSL（P0.05）.However,for male squid,there was no obvious relationship between MW/TSL and gonad maturity accordingly.The MW/TSLs for female squids with different mantle length（ML） group,group with ML 300-400 mm to ML 500-600 mm and ML 600-700 mm,group ML 400-500 mm to ML 500-600 mm and ML 600-700 mm,exist significant differences（P0.05）.When the female individual grows from ML 400-500 mm to ML 500-600 mm,the MW/TSL increases rapidly and the difference was significant（P0.01）.For male squid,the MW/TSLs between ML 350-400 mm and ML 400-500 mm,ML 400-450 mm and ML 450-500 mm also exist significant differences（P0.05）,when the squid attains ML 400-450 mm,the MW/TSL is the smallest.The studies have shown that sexual maturation and size of Dosidicus gigas have an obvious effect on its statolith growth,but the differences exist between male and female.
出处
《水产学报》
CAS
CSCD
北大核心
2010年第4期540-547,共8页
Journal of Fisheries of China
基金
国家自然科学基金项目(NSFC40876090)
曙光计划跟踪项目(08GG14)
上海市教委优秀青年基金(B-8101-080-0024)
上海市捕捞学重点学科(S30702)
关键词
茎柔鱼
耳石
性成熟
智利外海
Dosidicus gigas
statolith
sexual maturation
the sea off Chile
