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東澳定置漁場網型改良前後漁況之比較研究
A Comparative Study of Fishing Variations between Two Different Type Set Nets at the Coast of Tang-Ao
摘要
爲究明改良型定置網（雙落網）與傳統型定置網（單落網）之漁獲效率及漁期差異性，乃以東澳新協發定置漁場網型改良前後各5年之魚種別歷月漁獲統計資料加以檢測解析，結果如次： (1)網型改良後的總平均單位努力漁獲量較改良前成長3倍有餘。其中，尤以底棲性的紅甘鰺、浪人鰺、雙带鰺、白鰺及鮸魚，與洄游性的鮪、鰆、旗魚、塞氏鱵、細文鰩魚及鬼頭刀等的增產，明顯地受網型改變之影響。 (2)網型改良後的漁期平均增加達一個月；魚種別漁期受網型改良而有所變化者計11種。其中紅甘鰺、雙帶鰺、中華馬加鰆、薄葉單棘魨、尖頭鮫、銅鏡鰺及斐氏黄臘鰺等漁期提前；浪人鰺、白鰺、高麗馬加鰆及白帶魚之盛漁期延後；而白带魚及薄葉單棘魨更分別於各自的盛漁期成爲當月份的優勢漁獲物。
關鍵字
無資料並列摘要
With the aim to study the fishing variations between the single-trap set net and the double-trap set net, catch per unit effort (CPUE) and seasonal index derived from monthly landings at two fixed shore-nets along the coast of Tang-Ao in northeastern Taiwan were examined for the last 10 years from 1975 to 1984. And the results obtained are summarized as follows: (1) The mean CPUE of yearly total landings of the double-trap net has been increasing more than three times while compared with that of the single-trap net. The catch rate of Amberjack (Serbia dumerili), Yellow-fin trevally (Caranx ignobilis), Blue-striped runner (Elagatis bipinnulatus), Big-eyed scad (Trachurops macrophthaimus), Brown croaker (Miichthys miing), Yellow-fin (Thunnus albacares), Barred Spanish mackerel (Scomberomorus commerson), Sail fish (Histiophorus orientalis), Half beak (Hemiramphus sajori), Darkedged-wing flyingfish (Cypselurus opisthopus hiraii) and Common dolphin (Coryphaena hippurus) increased obviously with the change of the set-net construction. (2) It was found that the fishing period per year has been prolonged about 30 days after 1980. According to the seasonal variation analysis, the fishing seasons of Amberjack (Seriola dumerili), Yellow-fin trevally (Caranx ignobilis), Blue-striped runner (Elagatis bipinnulatus), Big-eyed scad (Trachurops macrophthalmus), Korean mackerel (Scomberomorus koreanus), Chinese mackerel (S. sinensis), Hairtail (Trichiurus haumela), Unicorn filefish (Aluterus monoceros), Angel sharks (Scoliodon walbeemii), Round scad (Decapterus maruadsi) and Small spot pompano (Trachinotus baillonii) were significantly affected by different types of set-net construction.