Abstract

We analyzed the distribution and abundance of the juvenile pinfish (Lagodon rhomboides) in Lagoon Yalahau and their relationship with the structural complexity of turtlegrass meadows (Thalassia testudinum). Night samplings were made on turtlegrass meadows during a year, with a bar network Renfro type with 1.0 mm mesh, in 8 stations: 4 in the external area (ZE) and 4 in the internal area (ZI) of the lagoon. In addition we took samples of turtlegrass with a PVC piping. With the collected samples, the structural complexity of turtlegrass was determined (plant surface area, density of shoots, biomass). The structural complexity of turtlegrass varied spacially and significant differences between zones were observed. A total of 2105 juvenile pinfish were collected, with an average size of 2.6 cm. The external zone presented the greatest abundance, biomass and average size of the pinfish. There were significant differences between the abundance and biomass of each area. For the above mentioned facts, the structural complexity of the turttlegrass meadows influenced in the distribution and abundance of the pinfish. Both zones serve as protection areas for the juvenile pinfish. Also due to graetest abundance the fishes, it is possible to infer that these turtlegrass meadows serve as feeding and nursery areas. In this sense, the turtlegrass meadows in Yalahau lagoon, can be considered as an essential fish habitat for the pinfish and other species of juvenile fishes. This type of studies allow the evaluation of the ecological importance that the seagrass meadows and their influence on the communities and populations of juvenile fishes.

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