臺灣鰻缐漁獲量的季節性變化及長期性變動傾向

Seasonal and Long-Term Changes of the Catch of Anguillid Elvers in Taiwan

曾萬年(Wann-Nian Tzeng)

《臺灣水產學會刊》 10卷1期 (1983/09) Pp. 1-7

https://doi.org/10.29822/JFST.198309.0001

摘要

臺灣鰻線的主要漁期為11~2月，盛期為12~1月。1980年11月~1981年4月以及1981年11月至1982年3月，兩次漁期於臺灣北部及南部之河口域調查鰻線的魚種組成，結果發現捕獲的鰻線種類大部分是白鰻(Anguilla japonica)。盛漁期時，其比例皆在90%以上。
以自相關法分析1964年至1981年臺灣全省鰻線生產量年變動傾向，顯示漁獲量之年間變化很大，且有九年周期變動的現象。1969~1970年及1978~1979年為其豐漁年，其餘時間漁獲量皆很少。目前漁況仍然落在低水準的周期內。文中並討論漁況變動之可能原因。

並列摘要

The main fishing season of the elvers in Taiwan is from November to February. Peak catch appears in December and January. Based on the daily catch data and sample of the elvers collected from three estuarine area of north and south Taiwan during the fishing seasons, November 1980-April 1981 and November 1981-March 1982, it was found that Anguilla japonica is the most dominant species, composed of ca. 90% of the total elvers catches.
The annual catch data (1964-1981) of the elvers in Taiwan were analyzed by auto- correlation method. It reveals a 9 years interval periodic fluctuation in the catch of elver. 1969-1970 and 1978-1979 are the good catch years, the other years are poor catch years. The fishing condition seems still falling in the period of poor catch in the present.