Effects of the addition of oak ( <i>Quercus robur</i> L.) and yucca ( <i>Yucca schidigera</i> ) on the water quality and growth performance of pacific white shrimp ( <i>Litopenaeus vannamei</i> ) cultured intensively in concrete tanks

Abstract The application of mixed natural extracts from oak ( Quercus robur L.) and yucca Yucca Schidigera ) (OY) in an intensive culture system for Pacific white shrimp Litopenaeus vannamei was able to improve the growth performance quality its rearing media. Twelve tanks sized 8 × 1.3 m were stocked with 500 post‐larvae −2 per tank treated 2, 2.5, 3 Kg Ha −1 OY. Physical chemical water parameters, including pH, dissolved oxygen, temperature, salinity, measured 4 times day during trial. Measurements other Ammonia (NH ‐N), Nitrite (NO 2 Nitrate performed second sixth after addition same measurements conducted control treatment every seventh‐day post exchange 90 days period. parameters (biomass, final body weight, feed conversion ratio, survival rate, percentage weight gain) nutrient retention rate evaluated culture. utilization OY significantly increased (FBW), gain (PWG), ratio (FCR), (%), biomass shrimp. Different dose applications reduced accumulation ammonia nitrite nitrate media compared control. However, there no significant differences protein, fat, ash, dry fiber, content among different levels This research concludes that could maintain a safe level nitrogen metabolites enhance cultured production systems using commercial concrete tanks.