| 珠江广东鲂的年龄、生长及其最大持续渔获量 |
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| 引用本文： | 王金潮,黄毅文.珠江广东鲂的年龄、生长及其最大持续渔获量[J].水产学报,1990,14(4):313-320. |
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| 作者姓名： | 王金潮 黄毅文 |
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| 作者单位： | 珠江水产研究所 广州
(王金潮)，珠江水产研究所 广州(黄毅文) |
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| 摘 要： | 本文对珠江广东鲂的年龄、生长及其种群最大持续渔获量进行了渔业生物学分析。用鳞片鉴定年龄,年轮形成时间为 3～6月,随着年龄增加而略有推迟。von Bertalanffy生长方程适用于广东鲂的体长、体重与年龄的关系。通过渔获物样本统计资料,在目前捕捞作业情况下,3 龄完全进入渔具选择,年总死亡率 φ=0.58,捕捞死亡率 E=0.27,自然死亡率 D=0.31。若能把首次捕捞年龄从 3 龄提高到 4 龄,捕捞强度控制在 F=0.35,渔获量可以比原来提高 16％左右,且产量也能持续下去。
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| 关 键 词： | 广东鲂 年龄 生长 最大持续渔获量 |
| 收稿时间： | 2/1/1990 12:00:00 AM |
| 修稿时间： | 6/1/1990 12:00:00 AM |
THE AGE AND GROWTH OF GUANGDONG BREAM(MEGALOBRAMA HOFFMANNI)IN THE PEARL RIVER WITH REFERENCE TO ITS MAXIMUM SUSTAINING YIELD |
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| Wang Jingchao and Huang Yiwen.THE AGE AND GROWTH OF GUANGDONG BREAM(MEGALOBRAMA HOFFMANNI)IN THE PEARL RIVER WITH REFERENCE TO ITS MAXIMUM SUSTAINING YIELD[J].Journal of Fisheries of China,1990,14(4):313-320. |
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| Authors: | Wang Jingchao and Huang Yiwen |
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| Institution: | Pearl River Fisheries Research Institute, Guangzhou;Pearl River Fisheries Research Institute, Guangzhou |
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| Abstract: | Guangdong bream has been a chief commercial fish in the PearlRiver. A study on the age and growth with reference to its maximum sustainingyield has been conducted. The scale is as good as the operculum for age determina-tion. The formation of annulus in the scale occurs from March to June every year.The relationship between the radius (R) of the scale and the length of the body isin linear regression. This relationship can be expressed as the formula: L=37.73R+50.52. The relationship between the age (t) and the body length (L) can be expre-ssed by the equation: L=4721-e~(-0.1?8?(t+0.1413))]. The weight (w)--age (t) relati-onship can be described as W=2808.61-e~(-0.1?8?(t+0.1413))]. The first maturity of the smallest female occurs at 254mm in length,320 grams in weight and three years of age, while She male occurs at 215mm in length, 180grams in weight and two years old. The absolute fecundity ranges from 54,074--375,300 eggs (131,024 eggs on the average). The total mortality of Guangdong bream in the Pearl River was calculated to be0.58, include natural mortality of 0.31 and a catching mortality of 0.27. At presentthe age class in the harvest is mainly three years old. In such a case it would bedifficult to maintain the maximum sustaining yield. If the catchable age class canbe shift to four years of age and the fishing effort is controlled to 0.35, a 16% in-crement in total yield might be expected and the primary relative abundance of thereproductive population can be maintained in a stable state. |
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| Keywords: | Megalobrama hoffmanni age growth maximum sustaining yield |
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