期刊
NEOTROPICAL ICHTHYOLOGY
卷 7, 期 2, 页码 217-222出版社
SOC BRASILEIRA ICTIOLOGIA
DOI: 10.1590/S1679-62252009000200013
关键词
Fish; Reproduction; Patos lagoon; Logistic function
类别
资金
- FAPERGS
- CAPES
- CNPq
Correct estimates of size at first maturity (L-50) are useful for fish stock management and different methods have been proposed. In this study we propose the use of a modified logistic to estimate L-50, including a variable asymptote (A). We also test the use of the Gonadossomatic Index (GSI) as a flag to establish the reproductive status of each female fish. The method is demonstrated using GSI data for four Neotropical fish species: Characiformes: Astyanax fasciatus (n = 473) and Oligosarcus robustus (n = 297); Siluriformes: Loricariichthys anus (n = 427) and Trachelyopterus lucenai (n = 195). The results were stable enough to propose this method be used for other fish species with different life histories and with a relatively unconstrained sampling programs. Nevertheless, a wide scale test program is desirable to identify any possible bias in this approach.
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