José Naranjo-Páramo

Evaluation of three feeding strategies on the culture of white shrimp penaeus vannamei Boone 1931 in low water exchange ponds

Abstract Three feeding strategies (feeding tables (FTA), feeding trays (FT) and complementation of natural food (CNF)) for white shrimp farmed in earthen ponds were evaluated in an experimental study conducted during 15 weeks at Bahia Kino, Sonora, northwestern Mexico. Significant differences ( p p > 0.05). The lowest feed conversion ratio (FCR) was 1.59:1, obtained in treatment CNF. It was not significantly different ( p > 0.05) from that obtained in treatment FT (1.69:1). Both were better than the FCR observed in treatment FTA: 2.39:1. Morning dissolved oxygen was significantly lower in treatment FTA ( p p Penaeus vannamei .

Effect of aeration rate on growth, survival and yield of white shrimp Penaeus vannamei in low water exchange ponds

A study was conducted in Bahia Kino, Sonora, northwest Mexico, to evaluate the effect of aeration rate on the growth, survival and yield of the white shrimp Penaeus vannamei farmed in ponds with reduced water exchange. Aeration rates of 0, 6, 12 and 24 h per day were tested. No significant differences in growth rate were detected among treatments. Survival and yield were significantly higher in ponds with 12 and 24 h of aeration.

Growth, metabolic and physiological response of juvenile Cheraxquadricarinatus fed different available nutritional substrates.

There are many factors in intensive culture conditions which vary the physiological response of organisms in culture affecting performance such as growth, metabolic levels in blood, respiratory metabolism and the inflection point of dissolved oxygen concentration. The study was conducted under high density culture conditions with multitrophic systems. Results show that the species can tolerate intensive culture conditions without affecting their growth and survival and has the ability to leverage multiple food sources. This work also shows that Cheraxquadricarinatus has the ability to maintain a low routine metabolic rate, is highly tolerant to limited dissolved oxygen conditions and thus uses energy efficiently. The metabolic rate in juvenile C. quadricarinatus was 0.07 ± 0.003 mg O2/g/h while the critical level of oxygenconcentration, when the organism passes from regulator to conformer is 0.483 ± 0.002 mg O2/L. This is significantly lower than previously reported for cultured decapod species.