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Revista de biología marina y oceanografía

On-line version ISSN 0718-1957

Abstract

GONZALEZ-SANSON, Gaspar et al. Spatial and temporal variations of juvenile fish abundance in Barra de Navidad coastal lagoon, Jalisco, México: Effects of hurricane Jova. Rev. biol. mar. oceanogr. [online]. 2016, vol.51, n.1, pp.123-136. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572016000100012.

Seasonal and spatial variations of nearshore juvenile fish assemblages were assessed inside the coastal lagoon of Barra de Navidad, Jalisco, Mexico. Sampling was carried out during 2 different periods: March 2011 to February 2012 in site 1 and October 2012 to November 2013 in sites 1 and 2. During the first sampling period, the hurricane Jova (October 2011) hits the study area and introduced an unpredicted environmental impact. Samples of fish assemblages were taken using a beach purse seine. Water salinity, temperature and sediment granulometry were measured. A total of 36,897 individuals of 61 species were collected and their total lengths were measured. 90% of the species and 96% of the individuals were classified as juvenile. Four taxa (Anchoa spp., Eucinostomus currani, Diapterus peruvianus and Mugil spp.) made more than 80 percent of catches in number. Significant differences were found in fish assemblage composition between sampling periods and between seasons for site 1, while significant differences were found between sites and between seasons for the second sampling period. A significant difference was found in the composition of fish assemblages before and after the hurricane Jova at site 1 during the first sampling period. Strong seasonal changes in salinity are most probably the cause of changes found in fish assemblages along the year, while differences in sediment granulometry and organic matter percentages could explain differences between sampling sites.

Keywords : Fish assemblages; coastal lagoon; hurricane; Mexican Tropical Pacific.

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