挪威春季产卵的大西洋鲱仔稚鱼年孵化量的估算方法

摘要

1986～1990年间,挪威卑尔根海洋研究所每年都对挪威西海岸春季产卵的大西洋鲱仔稚鱼的分布区进行一次综合性调查, 每年在大西洋鲱的孵化期,都在Sun nmre近岸和Buagrunnen的两个小区重复取样(通常每周2次),并用覆盖整个孵化区的综合调查所得的资料计算出仔稚鱼日孵化量,用两个小区所得的资料作孵化曲线,从而得出在孵化期内仔稚鱼孵化量占年总孵化量的百分比.1986～1990年间仔稚鱼年孵化量分别是1.7×1 012、3.9×1012、35.4×1012、72.8×1012和99.1×1012 尾.%A comprehensive survey in the larva-distributed area of Norwegian spring-spawning herring along west Norwegian coast was carried out annually by the Institute of Marine Research, Bergen, during 1986～1990.Moreover, 2 small subareas were sampled repeatedly (usually twice a week) off Sunnmφre and at Buagrunnen during the hatching period each year.The daily larval product ion was worked out with the data obtained from the comprehensive survey coverin g the entire larva-distributed area. Data obtained from the subareas had been us ed to construct the hatching curve so as to get the daily larval production perc entage in the annual larval production which could be estimated after then.The a nnual larval production from 1986 to 1990 were 1.7×1012,3.9×1012,3 5.4×1012,72.8×1012 and 99.1×1012 individuals.