| 摘要: |
|
| 关键词: |
| DOI： |
| 分类号: |
| 基金项目: |
|
| FISH BIOMASS ESTIMATES AT THE UPPER LAYER OF THE BOHAI SEA IN SUMMER, 1983 |
|
|
| Abstract: |
| Samples of fish for estimating their biomass were collected from more than 50 stations throughout the whole Bohai Sea by the epipelagic pair trawlers with a towing speed of 3.5 knots. The height of mouth of the trawl was 8m. Primary results estimated by traditional area method of the survey are as follows: The mean catch per unit effort was 26.9 and 11.9 kg/h, the biomass density was 0.311 and 0.137 ton/km2, the total biomass was 24,880 and 10,960 ton for June and July respectively. Forty nine fish species were collected during the two months in 1983. Engraulis japonic a is the most dominant species, accounting for three-fourths for June and One-third for July of the total catch by weight. |
| Key words: |
