东海长颌水珍鱼(GLOSSANODON HEMIFASCIATA)资源开发利用的研究

A STUDY ON THE EXPLOITATION AND UTILIZATION OF DEEP-SEA SMELT RESOURCES IN THE EAST CHINA SEA

据中国和日本1975－1982年期间在东海大陆架外缘和大陆坡各自调查所获拖网试捕与海况资料,分析研究结果：调查海域近底层温盐度周年变化很小,水平分布为内侧高、外侧低。长颌水珍鱼集群区夏季适温为11－15℃、适盐为34．4×10-3至34．6×10－3,冬季适温为12－18℃、适盐为34．5×10－3至34．7×10－3。水珍鱼周年分布于东海大陆架外缘和大陆坡上、中部一带(25°30′－32°00′N,水深120－600米),其集群区则在该带中部(28°00′－30°30′N,水深130－280米),该区有许多处海底平坦,鱼探映象明显,适合于单拖作业。根据资源面积密度法,算得水珍鱼原始资源量为41100吨。开发水珍鱼资源的时机已趋成熟。

Based on the data collected from the exploratory trawling and oceanic conditions, the research vessels of China and Japan surveyed independentyly in 1975 - 1982 on the areas of the outer continental shelf and continental slope of the East China Sea. The results obtained were analyzed as follows:(1)The annual variations of temperature and salinity are very small at the near bottom,the geographical distributions are high in the inner part and low in the outer part of the surveyed waters. The concentrated zone of deep-sea smelt, Glossanodon hemdesciata , was located in the waters with T=11 - 15℃, S= 34. 4 × 10-3 － 34. 6× 10-3 in summer ； but with T= 12- 18℃, S= 34. 5 × 10-3- 34. 7 × 10-3 in winter. The fish occurred in the belt of the outer continental shelf and the upper/middle continental slope (25°30′ - 32°00′N, 120－ 600m depth) of the East China Sea, while the concentrated fish school were discovered in the middle part of the belt (28°00′ -30°30′, 130-280m depth) all the year round. There is a lot of flat sea bed which is suitable for the operation of the otter trawler. Near the sea bed there were clear the fish school echo traces.(2) By means of the stock densit y-area method, assessment on deep-sea smelt was made. The standing stock biomass of the fish was estimated as 41100t. Abundant deep-sea smelt resources were found and have a better prospect for resources exploitation. It is the time to exploit and utilize the fish resources.