Analysis of the Variation of Fishing Condition between Hsinshefar and Chiafong Set-net Fishing Grounds in Water off East Coast of Taiwan (II)~ Analysis on Catch and Species Composition by Season ~

台灣東部新協發與佳豐定置漁場漁況變動比較分析（II）~季節別漁獲組成與產量分析~

鄭火元(Huoo-Yuan Jenq)

《高雄海洋科大學報》 26期 (2012/03) Pp. 1-18

https://doi.org/10.6983/KHHYKTHP.201203.0002

摘要

Annual logbook catch data of the Hsinshefar and Chiafong fishing grounds from 1996 to 2003 were analysed to assess spatial variation in species composition by season continuously according to previous report (Jenq 2011). Most of the catch in the two fishing grounds comprised pelagic migratory species. There was about 590 mt in annual average catch at Hsinshefar and 450 mt at Chiafong Company. Seasonal variation on catch was usually one catch peak occurring during February to June at Hsinshefar and two catch peaks in October-December and March- May at Chiafong. More species were caught at Hsinshefar than at Chiafong by season. Although there is seasonal dominant species, it is obviously different in the three fishing seasons at the two companies. Variation on seasonal catch species is smaller at Hsinshefar than that of at Chiafong. That is, CV of the Hsinshefar is less than CV of the Chiafong either by year or season. Yearly mean of catch species is 143 at Hsinshefar and 130 at Chiafong. Yearly CV of annual total production at Hsinshefar is less than that of Chiafong. There was no significant seasonal difference in catch (p＞0.01) for individual company, but there was significant difference between the two companies. Mean catch per unit effort (CPUE) by harvest was 1089kg (CV=20.9 %) and 754.3kg (CV=31.3 %) at Hsinshefar and Chiafong fishing companies, respectively.

關鍵字

定置網漁業 ； 新協發漁場 ； 佳豐漁場 ； 季節漁況變動 ； 漁獲組成

並列摘要

Annual logbook catch data of the Hsinshefar and Chiafong fishing grounds from 1996 to 2003 were analysed to assess spatial variation in species composition by season continuously according to previous report (Jenq 2011). Most of the catch in the two fishing grounds comprised pelagic migratory species. There was about 590 mt in annual average catch at Hsinshefar and 450 mt at Chiafong Company. Seasonal variation on catch was usually one catch peak occurring during February to June at Hsinshefar and two catch peaks in October-December and March- May at Chiafong. More species were caught at Hsinshefar than at Chiafong by season. Although there is seasonal dominant species, it is obviously different in the three fishing seasons at the two companies. Variation on seasonal catch species is smaller at Hsinshefar than that of at Chiafong. That is, CV of the Hsinshefar is less than CV of the Chiafong either by year or season. Yearly mean of catch species is 143 at Hsinshefar and 130 at Chiafong. Yearly CV of annual total production at Hsinshefar is less than that of Chiafong. There was no significant seasonal difference in catch (p＞0.01) for individual company, but there was significant difference between the two companies. Mean catch per unit effort (CPUE) by harvest was 1089kg (CV=20.9 %) and 754.3kg (CV=31.3 %) at Hsinshefar and Chiafong fishing companies, respectively.

並列關鍵字

Set-net fishery ； Hsinshefar fishing ground ； Chiafong fishing ground ； Seasonal fishing condition ； Species composition