| Sun Yao,Yu Miao,Zhang Bo,Tang Qisheng. 2002. In situ determination on food consumption and ecological conversion efficiency of a marine fish species, Hyporhamphus sajori. Acta Oceanologica Sinica, (3):407－414 |
| In situ determination on food consumption and ecological conversion efficiency of a marine fish species, Hyporhamphus sajori |
| In situ determination on food consumption and ecological conversion efficiency of a marine fish species, Hyporhamphus sajori |
| Received:January 22, 2002 Revised:February 20, 2002 |
| DOI： |
| Key words:Food consumption growth ecological conversion efficiency Hyporhamphus sajori |
| 中文关键词: Food consumption growth ecological conversion efficiency Hyporhamphus sajori |
| 基金项目:This study was supported by the Development;Programming Program of National Major Basic Research of China un-der contract No.G19990437. |
| Author Name | Affiliation | | Sun Yao | Yellow Sea Fisheries Research Institute, CAFS, Qingdao 266071, China | | Yu Miao | Yellow Sea Fisheries Research Institute, CAFS, Qingdao 266071, China | | Zhang Bo | Yellow Sea Fisheries Research Institute, CAFS, Qingdao 266071, China | | Tang Qisheng | Yellow Sea Fisheries Research Institute, CAFS, Qingdao 266071, China |
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| Abstract: |
| The food consumption and ecological conversion efficiency of a species marine pelagic and small size fish, Hyporhamphus sajori, were determined by using in situ stomach content method presented by Eggers. The results showed that:(1) the fish was taken in food all day, so empty-stomach rate was very low, taking up about 4.5% of the total determined fish number. However, the fish still has significant daily feeding rhythm. A feeding peak was found 0:00 o'clock at night, but feeding level was always high in the daytime; (2) relationship between instantaneous food content in stomach and corresponding time could be described as St=a·e-b·t. There was not significant difference of instantaneous gastric evacuation rate between two determinations, with average value being 0.13×10-2g/(g·h) (wet weight); (3) the daily food consumption tended to change in irregular waving form, with average value being (10.16×10-2±1.19×10-2) g/(g·d) (wet weight) or (55.56×10-2±6.51×10-2) kJ/(g·d). The wave distance is constant and about 14 d, but the wave height changed largely;(4) actual determining value of daily growth rate was 3.24×10-2g/(g·d) (wet weight) or 12.91×10-2kJ/(g·d), from which 31.89% (wet weight) or 23.24% kJ of ecological conversion efficiency could be obtained. |
| 中文摘要: |
| The food consumption and ecological conversion efficiency of a species marine pelagic and small size fish, Hyporhamphus sajori, were determined by using in situ stomach content method presented by Eggers. The results showed that:(1) the fish was taken in food all day, so empty-stomach rate was very low, taking up about 4.5% of the total determined fish number. However, the fish still has significant daily feeding rhythm. A feeding peak was found 0:00 o'clock at night, but feeding level was always high in the daytime; (2) relationship between instantaneous food content in stomach and corresponding time could be described as St=a·e-b·t. There was not significant difference of instantaneous gastric evacuation rate between two determinations, with average value being 0.13×10-2g/(g·h) (wet weight); (3) the daily food consumption tended to change in irregular waving form, with average value being (10.16×10-2±1.19×10-2) g/(g·d) (wet weight) or (55.56×10-2±6.51×10-2) kJ/(g·d). The wave distance is constant and about 14 d, but the wave height changed largely;(4) actual determining value of daily growth rate was 3.24×10-2g/(g·d) (wet weight) or 12.91×10-2kJ/(g·d), from which 31.89% (wet weight) or 23.24% kJ of ecological conversion efficiency could be obtained. |
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