TITLE:
Recruitment Age of Litopenaeus vannamei (Boone, 1931) (Decapoda: Penaeidae) in the Cabeza De Toro-La Joya Buenavista Lagoon System, Oaxaca-Chiapas, Mexico
AUTHORS:
Pedro Cervantes- Hernández, Pablo Torres- Hernández, Mario Alejandro Gómez- Ponce
KEYWORDS:
Closure Systems, Gulf of Tehuantepec, Recruitment Age, Recruitment Seasons, White Shrimp
JOURNAL NAME:
Open Journal of Marine Science,
Vol.7 No.4,
October
31,
2017
ABSTRACT: At present, the fishery of Litopenaeus vannamei continues overexploited in
the Gulf of Tehuantepec (GT), Mexico. From the available literature it was
demonstrated that marine closure systems implemented in GT have not
worked adequately since 1993, because these are completely protecting marine
recruitment seasons, and reproductive seasons were only partially considered
to protect. Due to these problems, new marine closure systems were proposed
in the literature, but they were not accepted by fishermen from GT because
they did not include marine and lagoon recruitment information. For this
reason, in this study both recruitment types were analyzed with estimations
on the recruitment age (RA), and its relationship with total length and weight.
To the Cabeza de Toro la Joya Buenavista lagoon system (CTJB-LS), it was
concluded that young recruits migration toward outside CTJB-LS elapsed between
3 and 5-m-olds, with the highest recruit flow in 4-m-olds. Thus, this
last age was called the RA of L. vannamei (at 106 mm). Maximum marine recruitment
ranked from June to July, and maximum reproductive seasons were
in October. In both recruitment seasons it was observed that biomass production
was different. In marine season RA recorded 8.4 g more than lagoon season
at the same size. Results were used in order to discus about atarraya nets
uses, and to propose the implementation of a lagoon closure during July inside
lagoon systems located in GT. With this proposal artisanal fishermen will
be allowed to use atarraya nets with mesh opening of 25.4 mm during June,
and they will obtain a good biomass production level as economic support.Additionally, with new marine closure systems shrimp reproductive seasons
will be protected (from July to November).