Accueil > Documentations scientifiques > Revues récentes > La Revue des ISTs de Madagascar > Actes des journées de recherche des ISTs et de leurs partenaires (...) > Sous-thème 4 : LE DEVELOPPEMENT RURAL, L’AGRO-ALIMENTAIRE, L’ELEVAGE ET (...) > Optimization of Stocking Densities and Feeding Diets on Litopenaeus (...)

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  Optimization of Stocking Densities and Feeding Diets on Litopenaeus vannamei Larviculture
  Revue des ISTs de Madagasikara

  Auteurs : F. Andriantahina , X. L. Liu , V. N. R. Randrianjafy , J. M. Razafindrajaona

  Keywords : Feeding frequency, Larval quality, Litopenaeus vannamei, Production efficiency, Stocking density
  
  

  [ENG] Several larval culture trials were performed in order to investigate the effects of stocking densities and feeding diets on larval growth, survival, and larval quality of Litopenaeus vannamei. For stocking densities, fixed initial densities (50, 100, 150 and 200 larvae l –1 ), as well as treatments where stocking densities changed throughout the culture period (in function of the culture volume), were tested. In the latter experiment, initial stocking densities ranged from 100 to 400 larvae l –1 . For the factor feeding diets (based on Artemia nauplii), the effects of both feeding rations (1.5, 2, 3 and 4 times the standard feeding rations) and feeding frequencies (3 or 6 times a day) on larval performance were also tested. All statistical analyses were performed using SPSS 17.2 software package (SPSS Inc.). The stocking densities and feeding diets significantly affected larval growth, survival, duration of culture cycle, and larval quality. The best initial stocking densities were 100– 150 l –1 when applying a constant water volume, which could be increased up to 400 l –1 if the water volume was increased throughout culture. However, higher densities (200 296larvae l –1 ) could be applied when feeding cost is not prohibitive. A feeding frequency of six times per day using first–stage Artemia nauplii was more effective than feeding only three times per day. Production efficiency based on the number of postlarvae per culture unit and the number of Artemia nauplii used per postlarva produced in the different treatments was assessed. These optimized stocking densities and feeding diets are expected to render L. vannamei larviculture more profitable and improve larval quality. The results may improve hatchery protocols and help sustainable progress of L. vannamei farming industries in the future.

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