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頁籤選單縮合
題名 | The Yield Per Recruit Analysis for Lizard Fish, Saurida Undosquamis, in the Southern Taiwan Strait=以單位加入生產量模式評估臺灣海峽南部正蜥魚資源的利用現況 |
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作者 | 李英周; | 書刊名 | 臺灣水產學會刊 |
卷期 | 24:1 1997.03[民86.03] |
頁次 | 頁83-92 |
分類號 | 439.2 |
關鍵詞 | 年齡組成; 單位加入生產量模式; 正蜥魚; Age composition; Yield per recruit model; Saurida undosquamis; |
語文 | 英文(English) |
中文摘要 | The specimens used in this study were sampled at Kaohsiung Gusan Fish Market from the landings of the baby trawlers that operated in Taiwan Bank from 1992 to 1994. the yield per recruit model was used to assess the fishing status for male and female fishes, respectively. The results revealed that (1) the age comp9ositions from age 0 to age 9 were.192,.113,.266,.171,.101,.093,.045,.014, .004,.000 in 1993, and .058, .123, .388, .216, .133, .072, .009, .000, .000, .00 0 in 1994;(2) the natural mortality rates were estimated as 0.2907 year for fem ale and 0.4989 year for male respectiveely;(3)if t=t �� =1 year old, the maximun Y/R occurred at F=0.30 year for female and at F=0.63 year for male;(4)if t �� =1.25 (the current exploited status), the maximum Y/R occurred at F=0.30, which showed a comparatively waste of effort in 1994 for female (F=0.53). However, If t �� =(the current exploited status), the maximun Y/R occurred at F=0.63, which appeared that there still had some space of effort in 1994 for male (F=0.32);(5) the yield isopleth of female exhibits that with M=0.2907, and t=1, as t �� approaches to 5.25, F to 0.72, maximun Y/R (84.1 g) is obtained;(6) the yield isopleth of male displays that with M=0.4989, and t=1, as t �� approaches to 2.25, F to 0.70, maximum Y/R (38.8 g) is obtained;(7) the lizard fish resources in this area have been under heavy fishing and/or biological stress. |
英文摘要 | 本研究於 1992 - 1994 年間取樣臺灣海峽南部作業之小型拖網漁船狗母魚之漁 獲物,並以單位加入生產量模式評估資源的利用現況,結果如下: ( 1 ) 1992 年之年齡百分組成由 0 歲至 9 歲分別為.192,.113, .266,.171,.101, .093,.045,.014, .004, .000; 1993 年則為 .005, .051, .194,.310, .161,. 253,.015,.009,.000,.000; 1994 年則為.058,.123, .388, .216,. 133,.072, .009,.000,.000, .000。( 2)所估計雌魚之自然死亡率為每年 0.2907,雄魚為 0.498 9。 ( 3 )假設 t=t �� =1 歲時,雌魚的最大單位加入生產量在 F=0.30,雄魚在 F=0.63 。 ( 4 )當 t=1.25 歲(目前開發情況),雌魚的最大單位加入生產量在 F=0.30, 顥示 1994 年投入努力量有過度浪費情行( F=0.53 )。 然而當 t �� = 1 歲(目前開發情況) ,最大單位加入生產量發生在雄魚 F=0.63,顥示出努力量尚有發展空間( F=0.32 )。 ( 5 )雌魚等生產量曲線( 84.1 g )可被獲得。( 6 )雄魚等生產量曲線顯示,當 t �搊� 近 2.25,F 接近 0.72,M=0.2907, 和 t=1 時,最大單位加入生產量( 38.8 g )可被獲 得。( 7 )本區狗母魚資源已處於沉重漁獲及生物壓力下。 |
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