印度洋西北海域秋季鸢乌贼渔场分布与浮游动物的关系

根据2004年10~11月我国鱿钓船在印度洋西北海域进行鸢乌贼资源调查所获得的资料,对表层浮游动物与鸢乌贼渔场分布之间的关系进行了探讨。结果表明:桡足类、箭虫类和糠虾类在调查海域的出现率在86%以上。浮游动物总生物量平均值为39.51±114.06mg/m3。鸢乌贼的平均日产量为4.6 t,平均CPUE为3.90 ind/线/h。在浮游动物中,生物量最高的种类为尖尾海萤,平均值为24.30mg/m3,但空间分布差异极大,并且与中心渔场分布无关。其次为箭虫类、桡足类和糠虾类,生物量平均值分别为9.18mg/m3、2.32mg/m3和1.38mg/m3,与中心渔场分布关系显著,并可作为渔场分布的指示种类。

The relationship between fishing ground distribution of Symlectoteuthis oualaniensis and zooplankton in the northwestern Indian Ocean in autumn

The relationship between distribution of fishing grounds of Symlectoteuthis oualaniensis and zooplankton was analyzed based on the investigation concerning Symlectoteuthis oualaniensis resources carried out in the northwestern Indian Ocean from October to November 2004.The results showed that the occurrence rates of Chaetognatha,Copepoda and Mysidacea were all more than 86%.The average biomass of zooplankton was 39.51±114.06mg/m~3 in all.The average production for Symlectoteuthis oualaniensis was 4.6t per day and the average CPUE 3.90 per line in one hour.In all the zooplankton, the highest biomass was Cypridina acuminate and its average value reached 24.30mg/m~3,but there was great difference in the spatial distribution of biomass,and it bore no relation to the formation of fishing grounds.The average biomass of Chaetognatha,Copepoda and Mysidacea was 9.18mg/m~3,2.32mg/m~3 and 1.38mg/m~3,respectively,and had close relation with the formation of fishing grounds,which may be considered as the indicator species for fishing grounds.