7 research outputs found
Use of lapillus otolith microchemistry as an indicator of the habitat of Genidens barbus from different estuarine environments in the southwestern Atlantic Ocean
The marine catfish Genidens barbus is an anadromous species from South America. The aim of the present study was to evaluate the use of lapillus otolith microchemistry (Sr:Ca; Ba:Ca andMg:Ca ratios) as an indicator of changes in habitat use and identify the
potential breeding areas and fish stocks of G. barbus populations from the Plata Basin (ParanĂĄ River Delta and De la Plata River estuary-Argentina) and Lagoa dos Patos coastal lagoon (southern Brazil). Sr:Ca, Ba:Ca and Mg:Ca ratios were measured in the core area (inner 4 rings) and external area (outer 3â4 rings) of the otoliths by ICP-OES. The Sr:Ca ratio tended to be higher in the otolith external area than in the core area, while the Ba:Ca ratio followed the opposite pattern. This suggests the displacement of fish toward higher salinity areas. The Sr:Ca, Ba:Ca,Mg:Ca ratios in the core and external
areas of the otoliths from the Plata Basin differed significantly from those of the otoliths from Lagoa dos Patos. This may indicate the occurrence of two different breeding sites and at least two fish stocks in the study region
Review and consideration on habitat use, distribution and life history of Lycengraulis grossidens (Agassiz, 1829) (Actinopterygii, Clupeiformes, Engraulididae)
In this paper, we present a summary of the current knowledge of Lycengraulis grossidens, a widely distributed coastal fish that occurs from Belize to Argentina. This species is abundant in estuaries along the Southwest Atlantic Coast and is important for recreational fishing, and as bycatch of shrimp fisheries. We compiled data available on taxonomy, phylogeny, ecology, fisheries and organized conceptually the life cycle of the species according to modern estuarine-use classification. Our review showed that along its geographic distribution and inside some particular environments (i.e., estuaries and costal lagoons) the species have been classified in a variety of ways in order to describe the remarkable complexity of habitat use that varies from freshwater resident, anadromous, marine migrant, estuarine resident, marine stragglers, catadromous to semicatadromous. We conclude that L. grossidens is able to reproduce either in freshwater or estuarine water and postulate that it has a high plasticity in habitat use and life history, with migratory and resident contingents in the same local population. There seems to be a latitudinal change in migratory behavior of this species along the South America Coast, prevailing anadromous or semi-anadromous pattern at higher latitudes and marine migrants at the tropical northeast coast of Brazil.Neste trabalho Ă© apresentada uma compilação do conhecimento atual de Lycengraulis grossidens, uma espĂ©cie de peixe amplamente distribuĂdo pela costa oeste do AtlĂąntico Sul, ocorrendo de Belize a Argentina. Esta espĂ©cie Ă© abundante nos estuĂĄrios e tem importĂąncia na pesca recreacional alĂ©m de sofrer impacto da pesca do camarĂŁo. SĂŁo revisados dados publicados sobre a taxonomia, filogenia, ecologia, pesca e ciclo de vida da espĂ©cie. Nossa revisĂŁo mostrou que, ao longo de sua distribuição, a espĂ©cie tem sido classificada de vĂĄrias formas na tentativa de descrever seu uso do habitat, desde residentes de ĂĄgua doce, anĂĄdromos, marinhos migrantes, estuarinos residentes, catĂĄdromo e semi-catĂĄdromo. Conclui-se que a espĂ©cie Ă© capaz de se reproduzir em ĂĄgua doce ou salgada, com uma alta plasticidade no uso do habitat e na sua histĂłria de vida, com componentes migrantes e residentes no mesmo local. AlĂ©m disso, parece haver uma mudança no comportamento migratĂłrio da espĂ©cie em diferentes latitudes, mostrando um padrĂŁo anĂĄdromo ou semi-anĂĄdromo nas maiores latitudes e marinhos migrantes ao longo da costa tropical do Brasil