碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 103 / Jack mackerel Trachurus japonicus, widely distributed in the East China Sea and coastal waters of Japan, Korea, and Taiwan, is one of the most important fish resources in the northeastern waters off Taiwan. In recent years, many studies regarding the age, growth and reproduction of jack mackerel has been reported. However, the information of their early life history in the northeastern waters off Taiwan is still unknown. In order to solve the problem, the larval samples collected from different sources in the study area during 2005-2014 were used to determine age information of larval fish. The relationship between body length and daily age of the samples preserved by ethanol solution was established, with which the daily age of the samples preserved by formalin solution. A total of 402 larvae samples were analyzed, with body length from 1.5 to 7.3 mm and the ages were estimated from 0 to 30 days. Gompertz growth equation was used to describe the biological characteristics of age and growth of early life. The results are summarized as follow: (1) The distribution of jack mackerel in the northeastern waters off Taiwan was dominated by small larvae of body length ranged from 3-4 mm, which indicates that northeastern waters off Taiwan were spawning grounds and the nursery grounds for jack mackerel. (2) Initial length of the jack mackerel is 1.47 mm, growth rate of early life stage is 2.30 mm/d, and the decreasing growth rate is 0.04 mm/d. (3) Growing rates of larvae increases significantly from preflexion stage to flexion stage and slows down thereafter. (4) The hatching date distribution estimated by daily rings indicated that jack mackerel tends to spawn at the periods of new moon and half-moon.
| Identifer | oai:union.ndltd.org:TW/103NTOU5451012 |
| Date | January 2015 |
| Creators | Li, Ping, 李屏 |
| Contributors | Lu, Hsueh-Jung, Wang, Yu-Tzu, 呂學榮, 王友慈 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 67 |
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