Minette Tabi Eyango Tomedi, Claudine Tekounegning Tiogué, Joseph
Eben Penkem, Eric Mialhe

Published 05/12/2014, International Journal of Multidisciplinary Research and Development


ABSTRACT
Effect of salinity on survival and growth performances of marine shrimp Penaeus notialis fingerlings was carried out between April and September 2011 at AquaSol structure in IRAD of Kribi in Cameroon. A pregnant female with total weight 32 g and 15 cm total length has been collected in the natural environment by a fisherman using a bottom thread. Thirty 20 days old post larvae (PL20) born from this progenitor were seeded in triplicate in plastic bins at 15‰ (S0), 20‰ (S1), 25‰ (S2) and 30‰ (S3) salinity. Survival rates were high regardless of salinity. However, the higher survival rates (94.44 and 96.67%) were respectively recorded from 25 ‰ and 30 ‰ salinity. The higher feed conversion ratio, mean weight and weight gain were obtained at 15 ‰ salinity. The best specific growth rate was recorded at 20 ‰.

Keywords: Exogenous factors, Penaeus notialis, growth, survival, Cameroon

INTRODUCTION
Aquaculture involves several types of livestock including shrimp culture. According to [1]shrimp is the most consumed product in the world [2]. Aquaculture farms provide 20 to 25% of the world's marine shrimp production [3]. Asia is the largest supplier of shrimp in the world with 88% of production, 41% from China alone [1]. The rest (12%) is largely provides by the Latin America. According to [4]shrimp farming is recent in Africa and in most cases, African farms produce the shrimp Penaeus monodon; highly appreciated in the world market for its growth performances [1]. In Cameroon the data available on the shrimp fishery were merely within the marine capture [5]. Despite the production of freshwater shrimp; shrimp production increased from 2000 tons in 1972 to around 250-450 tons in 2006 [5]. This drastic decline in shrimp production is the result of overexploitation, climate change, pollution and destruction of mangroves for shrimp spawning grounds; associated with rapid population increase [2]. To this context, the need for domestication and biodiversity conservation of endogenous shrimp was imposed; therefore the first potential breeding structure of shrimp was construct in Cameroon [6]. The breeding success of all living species implies a good control of its environment. According to [7], physico-chemical water conditions are essential to the vital functions of aquatic species. The study on the effect of salinity in survival, growth, and osmotic capacity of early juveniles of Farfantepenaeus brasiliensis have shown that when juvenile shrimp are exposed to environmental variations, there occur changes in the osmotic and ionic balance as well as assimilation and growth [8]. Furthermore, domestication and breeding of a species depends on the knowledge of the factors promoting its growth and survival [9]. The basis of the shrimp farming relies on the availability of larvae / post larvae [10]. Temperature and salinity are among the most important environmental factors affecting the breeding of post-larval penaeid [11]. In Cameroon, some studies have already been conducted in captivity on the effects of environmental factors on shrimp reproduction and growth to the mysis and post-larvae1 stages [12, 13, 14, 15, and 16]. To our knowledge no study has been done on the effects of these factors on juvenile rearing. This work is therefore devoted
to evaluate the effect of salinity on the survival and growth of juveniles of marine shrimp Penaeus notialis in captivity.

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