EFFECT OF DISSOLVED OXYGEN AND TEMPERATURE ON GROWTH, SURVIVAL AND BODY COMPOSITION OF JUVENILE FARFANTEPENAEUS CALIFORNIENSIS (HOLMES)

L. Ocampo, H. Villarreal, M. Vargas, G. Portillo & F. Magallon-2000

Aquaculture Research, 31(2): 167-172

Abstract:

Survival, growth and proximal body composition of juvenile Farfantepenaeus californiensis (Holmes) were examined at two dissolved oxygen concentrations (mean 5.8 and 2.6 mg/L) and three temperatures (19, 23 and 27 C) for 50 days. Three replicate experiments were performed with a 12 h light/dark photoperiod. Survival was 68-85% at the lower dissolved oxygen level and 77-82% at the higher level and was not significantly affected by the treatments (P >0.01). Growth at the lower oxygen concentration was significantly less (P <0.01) than at the higher concentration, with growth rates of 2, 12 and 24 mg/day from the lowest to the highest temperature and 4, 17 and 26 mg/day for the three temperatures at the higher dissolved oxygen level. Body lipids were 1.2% wt/wt at the higher temperature and 2.1% wt/wt at the lower temperature, while proteins were 15.1% wt/wt at the higher temperature and 12.5% wt/wt at the lower temperature. These results indicate that low oxygen levels and low temperature significantly depress growth at this particular stage of life.

(Laboratorio de Ecofisiologia de Crustaceos, Division de Biologia Marina, Centro de Investigaciones Biologicas del Noroeste (CIBNOR), Apdo. Postal 128, La Paz, B.C.S. 23000 Mexico)

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