论文部分内容阅读
北海是世界上鲱鱼渔业资源最富饶的海区之一。它与其它海区(如挪威海)不同的是,角产量从未急剧地下降过;近十年来,北海鲱鱼年产量均在71—85万吨之间,这也说明了北海蕴藏着具不同产卵时期的、栖息分布海域广阔的鲱科鱼类。其中经济价值最高的为夏、秋季产卵的多格滩(Dogger Bank)鲱鱼,这种鲱鱼大都分布于北纬53°—61°之间的整个海域。春季产卵的鲱鱼分布于北海北部,但在个别年份大量的大西洋—斯堪的纳维亚鲱鱼群亦游入该海区。秋、各季产卵的鲱鱼栖息于北海南部。
Beihai is one of the richest sea areas in the world with herring fishery resources. Unlike other sea areas (such as the Norwegian Sea), the hori- zontal output has never dropped sharply. For the past 10 years, the North Sea herring has produced between 71 and 85 tons of annual output of herring, which shows that the North Sea contains different types of products Egg period, the habitat distribution of the herring family of vast waters. Among the most economically valuable are the herring of the Dogger Bank spawning in the summer and fall, most of which spread throughout the sea between 53 ° -61 ° N. Spawning herring spring spawns in the northern North Sea, but large numbers of Atlantic-Scandinavian herring swarms migrate into the sea in individual years. Autumn, herring spawning season seasons in the southern North Sea.