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首页> 外文期刊>ICES Journal of Marine Science >Evidence for a clustered spatial distribution of clupeid fish schools in the Norwegian Sea and off the coast of southwest Africa
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Evidence for a clustered spatial distribution of clupeid fish schools in the Norwegian Sea and off the coast of southwest Africa

机译：挪威海和西南非洲沿海近海鱼类类鱼群聚集的空间分布证据

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摘要

To quantify and characterize the spatial distribution of clupeid fish schools, sonar data were collected during surveys off the coast of Namibia in 1994 (pilchard (Sardinops sagax), anchovy (Engraulis capensis), and round herring (Etrumeus whiteheadi)), off Angola in 1995 (sardinella (Sardinella sp.)) and in the Norwegian Sea in 1997 and 1998 (Norwegian spring-spawning herring (Clupea harengus L.)). The two-dimensional distances between clupeid schools were calculated in the order that the different schools were observed along the survey vessels transect lines. In all four surveys, two different modes (frequency distribution maximums) were observed. The first mode, representing the most usual interschool distance, was about 60m. The second mode, around 1600m, probably represented the distances between different clusters. The distances between clupeid schools and between different clusters were found to be about the same for separate pelagic clupeid species, locations, and years of observation. The mean diameters of the school clusters were estimated to vary between 450 and 1450 m.
机译：为了量化和描述丘比特鱼类群的空间分布，1994年在纳米比亚沿海（沙丁鱼（Sardinops sagax），an鱼（Engraulis capensis）和鲱鱼（Etrumeus whiteheadi））进行的调查中收集了声纳数据。 1995年（沙丁鱼（Sardinella sp。））和1997年和1998年在挪威海（挪威春季产卵鲱鱼（Clupea harengus L.））。按照沿调查船样线观察不同学校的顺序，计算了丘比特学校之间的二维距离。在所有四个调查中，都观察到两种不同的模式（最大频率分布）。第一种模式代表最平常的校际距离，大约为60m。第二种模式约为1600m，可能代表了不同星团之间的距离。对于单独的中上层丘比特物种，位置和观测年，发现丘比特流派之间以及不同星团之间的距离大致相同。估计学校群的平均直径在450至1450 m之间变化。

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