Journal
LATIN AMERICAN JOURNAL OF AQUATIC RESEARCH
Volume 40, Issue 2, Pages 335-344Publisher
UNIV CATOLICA DE VALPARAISO
DOI: 10.3856/vol40-issue2-fulltext-8
Keywords
Dasyatis americana; disc width at maturity; reproductive cycle; fecundity; gulf of Mexico
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Funding
- Bureau of Forest and Fisheries Development (SEDAFOP) of the Tabasco State Government, project Marine small-scale fisheries of Tabasco
- Fondo Mixto Conacyt-Gobierno del Estado de Tabasco, project Biologia y pesqueria de tiburones y rayas en las costas de Tabasco [TAB-2007-C09-74601]
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The southern stingray Dasyatis americana (Hildebrand & Schroeder, 1928) is the most landed elasmobranch by small-scale fleets in southern gulf of Mexico. However, little is known of its life history parameters in this region. In this study, a total of 900 specimens were collected from February 2006 to December 2008 to determine the reproductive parameters needed for population assessments by means of ecological risk assessments or demographic analysis. Results suggested that females of D. americana reproduce annually, with a gestation of 7-8 months. The reproductive cycle of females is asynchronous, with ovulation and parturition occurring throughout the year. Females and males matured at 764 and 517 mm disc width (DW50) respectively. D. americana has one of the highest fecundity among dasyatids, from 2 to 7 embryos, with a sex ratio of embryos of 1:1. A linear relationship between maternal DW and fecundity was estimated, the larger females contain more embryos. The status of the population of D. americana is a cause of concern in the southern gulf of Mexico due to its high frequency of capture in artisanal fisheries and its apparently low biological productivity.
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