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Population dynamics and reproduction of wild longsnout seahorse Hippocampus reidi

Published online by Cambridge University Press:  17 October 2011

Ana C.G. Mai  and
Gonzalo Velasco
Ana C.G. Mai*
Affiliation:
Pós-graduação em Oceanografia Biológica, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
Gonzalo Velasco
Affiliation:
Instituto de Oceanografia, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil, CEP 96101-900
*
Correspondence should be addressed to: A.C.G. Mai, Pós-graduação em Oceanografia Biológica, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil email: anacecilia_mai@yahoo.com.br
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Abstract

Life-history characteristics such as growth, mortality, and size at sexual maturity of the seahorse Hippocampus reidi were investigated in situ in north-eastern Brazil from August 2006 to July 2007. The von Bertalanffy growth constant K was estimated at 1.195 year−1 and L∞ was set as 20 cm according to Taylor's relationship, using a Lmax of 19 cm. The smallest male with a brood pouch and the smallest male with a fully mature pouch measured 9 and 9.5 cm (height), respectively, while the smallest mature female measured 8.8 cm. Appropriate reproductive individuals were recorded throughout the study, with peaks from May to November. The size of first effective reproduction (carrying embryos) was 12.4 cm for males, a value higher than previously reported. Estimated instantaneous rate of natural mortality ranged from 1.43 to 1.58 year−1. The estimated life span for the species was 30 months.

Keywords

American longsnout seahorsereproductiongrowthmark–recaptureSyngnathidaefirst maturitylife span and survival
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 2 , March 2012 , pp. 421 - 427
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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