Cold Tolerance of Sea Cage Cultured Cobia Rachycentron Canadum in Penghu, Taiwan

澎湖箱網養殖海鱺的低溫耐受性

古鎮鈞(Chen-Chun Ku) ； 陸知慧(Chih-Hui Lu)

《臺灣水產學會刊》 35卷2期 (2008/06) Pp. 127-131

https://doi.org/10.29822/JFST.200806.0002

摘要

本文探討當冬季海水溫度下降至12℃後箱網養殖海鱺的存活率。30尾小海鱺蓄養在50公升的循環過濾的水族缸內，放置在冷藏櫃內並以每小時低於0.5℃的速率降溫。發現海鱺在低水溫的LD50為12.1℃。水溫下降至15.1℃時，多數魚苗沉於缸底，第一尾海鱺苗死亡的溫度為13.3℃，當水溫下降至11.2℃，所有的海鱺苗均死亡。本研究也利用2008年2月的寒潮評估澎湖箱網養殖海鱺的低溫耐受性，發現箱網養殖海鱺在海溫下降到14℃時出現死亡，11.5℃時所有箱網內的海鱺都死亡。這些結果指出海鱺一定要養殖在全年最低海溫14℃以上的海域。

關鍵字

海鱺 ； 低溫耐受性 ； 大量死亡 ； 箱網養殖 ； 澎湖

並列摘要

This paper investigated the survival of sea cage cultured cobia when sea temperature dropped down to 12℃ during the winter time. 30 fish were stocked in a 50-L recirculating aquarium in a display refrigerator and the water temperatures were decreased at a rate of less than 0.5℃ per hour. When the water temperature reached 15.1℃, most of cobia settled to the bottom of the aquarium. The LD50 of cobia for low temperature was 12.1℃. Initial mortality was observed at 13.3℃, but all fish were dead by the time the temperature reached 11.2℃. The survival of sea cage cultured cobia were also observed when a serious cold current occurred in February 2008, Penghu. Sea cage cultured cobia began to die when the temperature dropped to 14℃, and 100% mortality had occurred by 11.5℃. Results of this study indicated cultured cobia required sea water temperature higher than 14℃.

並列關鍵字

cobia ； cold tolerance ； fish kill ； sea cage culture ； Penghu