Studies on the age and growth of Japanese butterfish, Psenopsis anomala in the waters off Guei-Shan Island, northeastern Taiwan
| Autor: | Li-Yu Hung, 洪麗玉 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Age and growth of Japanese butterfish, Psenopsis anomala in the waters off Guei-Shan Island, northeastern Taiwan were examined based on samples collected from Mar. 2007 to Jul. 2008. In total, 734 samples including 340 females,363 males, and 31 undifferentiated were collected. Size (in terms of length and weight) of sample ranged from 11.70 to 25.60 cm, and 30.25 to 254.31 g for female,and 10.70 to 23.20 cm, and 24.80 to 185.89 g for males. There was a difference found in body weight－total length relationships between sexes. The equations are BW= 0.0248 * TL2.838 for females, and BW= 0.0424 * TL2.647 for males. The relationships between total length (TL) and radius of otolith (R) were estimated to be TL=10.684R – 2.135 for female, and TL=8.862R + 0.884 for males, respectively. The annulus was formed once per year, and was between July and August based on the analysis obtained from marginal increment ratio. The oldest age group for female and male fishes was 4. The population was dominated by age 2 for males, and was 3 for females. The von Bertalanffy growth equations derived from non-liner method were Lt = 23.651( 1-e-0.425(t+1.049) ) for females, and Lt = 20.953( 1-e-0.695(t+0.540) ) for males. The results obtained here were also compared with studies conducted in Japan for understanding the influences of geographical variation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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