Reproductive Biology of Black Croaker Atrobucca nibe in the Waters off Southwestern Taiwan
| Autor: | Li Ting Hsiao, 蕭琍婷 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 The black croaker (Atrobucca nibe) is one of the important commercial species for trawl fishery in southwestern Taiwan. This study aims to understand the reproductive biology of black croaker in the waters off southwestern Taiwan. A total of 871 specimens (348 females and 523 males) were sampled monthly from the trawl catches landed at Tongkang fishing port from July 2012 to July 2013. The range of total length (TL) and body weight (BW) in this study are 158.3-480 mm and 42.6-1247.4 g, respectively. The relationships between total length (TL) and body weight (BW) estimated as BW=2.0X10-5TL2.9248 (R2=0.974，n=348) for females and BW=2.0X10-5TL2.9068 (R2=0.967，n=523) for males. Based on the macroscopic appearance, histological examination of ovary, gonadosomatic index, and oocyte diameter monthly distribution, the spawning season for black croaker in the coastal waters off southwestern Taiwan is from January to May and peaks in March to May. Mean fecundity and mean batch fecundity of this species were estimated as 247,426±227,408 and 57,576±37,205, respectively. Relative fecundity and relative batch fecundity of this species were estimated as 139~1387 and 42~265, respectively. The sex ratio is 0.40 (Female/Total) and females outnumbered males at ≥ 300 mmTL. The sizes at 50% maturity (L50) were estimated 309.68 mm TL and 243.73 mm TL for the female and male, respectively. Logistic curves describing the relationship between proportion of maturity at each length interval and total length were estimated as P=1/(1+e6.29-0.02TL) for females and P=1/(1+e5.51-0.02TL) for males. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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