TITLE:
Immigration of Post Larvae of Penaeid Shrimp to Terminos Lagoon, Campeche, México: 2013 Annual Cycle
AUTHORS:
César Flores-Coto, Daniel Embriz-Alba, Mario Alejandro Gómez-Ponce, Juana López-Martínez, Laura Sanvicente-Añorve
KEYWORDS:
Shrimp, Immigration, Magnitude, Sizes
JOURNAL NAME:
Open Journal of Ecology,
Vol.8 No.9,
September
28,
2018
ABSTRACT: Immigration density magnitude and
entry sizes of shrimp postlarvae to Terminos Lagoon were analyzed through
sixteen fortnightly sampling from March to November in 2013, in three levels in
the deepest channel of the Puerto Real inlet. Trapezium nets were used with 1.5 m length, 50 cm
mouth diameter and 505 μm mesh, during each sampling 12 casts of 15 minutes/each were made. It was determined the presence of two species Litopenaeus setiferus and Farfantepenaeus duorarum, with total densities of
41.284 and 37.558 Pls 100 m-3 respectively. The annual cycle of
immigration of postlarvae was very similar for both species, with a clear
pattern of immigration throughout the year, linked to climatic variation, with
the highest densities (88%) during rainy season. There were two periods of
maximum density, related to the periods of greatest reproduction of these
species. The density variation among cast reflects the presence of at least two and probably more postlarvae banks, located
some closer than others to the mouth of the lagoon and with different densities
in them. The average sizes of the two species were 7.9 mm total length of L. setiferus and 9.0 mm of F. duorarum. The differences in income
sizes of both species seem to indicate the habitat preference of adult
populations, L. setiferus occurring
in more coastal areas than F. duorarum.
Considering the variation in density and sizes throughout each sampling period,
it is evident that the larvae on the banks belong to different cohorts and that
have coincided in their location in front of the mouth.