碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 98 / Fisheries biology of Acropoma japonicum in surrounding waters of Guei-San Island, northeastern Taiwan were examined based on samples collected from Sept. 2008 to Sept. 2009., In total, 3027 samples including 1451 females, and 1147 males, as well as 402 undifferentiated individuals were obtained. Size of samples ranged from 3.0 to 17.4 cm in fork length, and 0.51 to 90.9 g in weight. There was no difference found in body weight-fork length relationships for both sexes. The combine equation is . The spawning season of A. japonicum was from Apr. to Nov.. The size at first maturity for female was 6.2 cm, and was 6.4 cm for male. The fecundity estimated ranged from 5,900 to 66,902, and averaged at 14,703 ± 1,376 (n=50), while the batch fecundity was estimated to be from 2,827 to 15,530 (n=22), with an average of 5,873 ± 594. There were no differences found in sex ratio of 50 percentage for most months except for Sept. Oct. and Dec.. Seasonal changes in condition factor (CF) of the species were less evident for both sexes, and showed relative higher only in the spawning season. The seasonal variation in hepatosomatic index (HSI) for female fish also was not evident, but it was significantly lower during the spawning season for male fish. The Visceral Index (VI) for both sexes also were lower between May and Sept., and higher from Dec. to Apr.. These patterns Indicated that energy required for spawning of the species may mainly derived from visceral and liver, and male fish may spend more energy for spawning than female. The maximum ages for female and male fishes were estimated to be about 5 and 4, respectively. The age at first maturity for female was 1.21, and was 1.11 for male. The von Bertalanffy growth equations derived from non-liner method were Lt =29.71(1-e-0.0867 (t+1.5866) ) in length, Wt = 473.52 (1 - e -0.0867 ( t + 1.5866 ) ) 3.029 in weight. The population for female and male was dominated by ages 2 to 3 individuals, with percentage of 7.33%，58.67% and 30.33%, in each of the age classes for male, and 10.00%，38.67% and 37.67% in each of the age classes for female. Male fish older than age 4 was only 3.67%, and 13.67% for female.
| Identifer | oai:union.ndltd.org:TW/098NTOU5451029 |
| Date | January 2010 |
| Creators | Chih-Hua Yu, 尤志華 |
| Contributors | Shyh-Bin Wang, Shoou-Jeng Joung, 王世斌, 莊守正 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 80 |
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