Abstract
Monthly samplings were conducted at San Quintín Bay (Baja California, Mexico) in 1994 to determine the fish species assemblage, their abundance, frequency of occurrence, and movement. The sampling gear used included the otter trawl and beam trawl (5 and 10 m depth), beach seine net (<3 m depth), gillnet, and hook and line. The 5 and 3 m depths were characterized by seagrasses. A total of 64 fish species were identified. The most important species according to the index of community importance (abundance and occurrence) were the bay pipefish (Syngnathus leptorhynchus), the California halibut (Paralichthys californicus), the shiner surfperch (Cymatogaster aggregata), the diamond turbot (Hypsopsetta guttulata), and the black surfperch (Embiotoca jacksoni). Other abundant species were the topsmelt (Atherinops affinis), which inhabits the zone close to the beach, and the slough anchovy (Anchoa delicatissima), a temporal visitor to the lagoon. Low temperatures were recorded during April and May, coinciding with a movement of fishes towards the inner part of the bay.
Highlights
Las lagunas costeras son importantes para la protección y alimentación de peces (Hammann y Rosales-Casián, 1990; Rosales-Casián, 1997a)
High densities of new recruits of the California halibut, Paralichthys californicus, have been found in protected and semiprotected habitats, while low densities have been found in the open sea Ciencias Marinas, Vol 30, No 1A, 2004 semiprotegidos, y bajas densidades en mar abierto (Allen et al, 1990)
The bay pipefish, Syngnathus leptorhynchus, was the most abundant (23.7%), followed by the shiner surfperch, Cymatogaster aggregata (14.5%); both inhabit seagrass beds at depths of less than 5 m
Summary
Las lagunas costeras son importantes para la protección y alimentación de peces (Hammann y Rosales-Casián, 1990; Rosales-Casián, 1997a). Los peces ingresan como larvas o juveniles, se refugian de depredadores y aumentan su tasa de crecimiento por la elevada producción de alimento y por la temperatura superior a la de las aguas oceánicas adyacentes (Kramer, 1990). Un ejemplo es el lenguado de California (Paralichthys californicus), ya que se han encontrado altas densidades de nuevos reclutas en hábitats protegidos y. Fish enter as larvae or juveniles, find refuge from predators, and their growth rate increases because of the high food availability and higher temperatures than the adjacent ocean waters (Kramer, 1990). High densities of new recruits of the California halibut, Paralichthys californicus, have been found in protected and semiprotected habitats, while low densities have been found in the open sea Ciencias Marinas, Vol 30, No 1A, 2004 semiprotegidos, y bajas densidades en mar abierto (Allen et al, 1990). Después de crecer en los ambientes protegidos, la migración de los peces representa un enlace con los cuerpos de agua adyacentes, que además de repoblamiento, es fuente de dispersión de energía y nutrientes (Deegan, 1993)
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