Research Article: Effeciency of Spirulina platensis cultured with different nitrogen regimes on larval development, growth and survival rate of white shrimp, Litopenaeus vannamei n.R.۱

The blue-green algae Spirulina platensis was cultured with different nitrogen regimes (NH۴Cl, NH۴NO۳ and KNO۳) with concentrations of ۰.۰۱۰, ۰.۰۲۵ and ۰.۰۵۰ M and then fed to Litopenaeus vannamei at ۱۹ days post hatch (PLI) to evaluate the nutritional quality. At the end of the experiment, growth and survival rate were determined, and the larval development was calculated. The maximum protein content was obtained in culture media containing NH۴NO۳ followed by NH۴Cl and KNO۳ (p>۰.۰۵). Moreover, in all S. platensis cultures, increases in nitrogen concentrations led to increases in protein content. The present study showed that, with the exception of shrimp larvae at ۵ days post hatch, L. vannamei shrimp larvae fed on S. platensis cultured in NH۴NO۳, as a nitrogen regime, generally developed significantly (p<۰.۰۵) faster to next stages compared with the other treatments. However, the survival rate (%) and total length (mm) of shrimp larvae fed on S. platensis did not show any significant difference (p>۰.۰۵) when the nitrogen was varied in terms of regimes. Overall, the study points to the potential effectiveness of using NH۴NO۳ as a nitrogen regime in S. platensis culture media in producing live food for the hatchery production of L. vannamei shrimp larvae.

کلیدواژه ها:

Nitrogen ، Spirulina platensis ، Survival rate ، Larval development ، Litopenaeus vannamei