Calidad de agua y desarrollo larval de Litopenaeus Vannamei en tanques para larvicultura con aireación artesanal y manguera microporosa.

Abstract

The ideal concentrations of dissolved oxygen (DO) in larviculture are key to achieving correct growth and development in each of its larval stages. For this reason, several aeration systems with different bubble sizes have been implemented, of which the use of microbubbles stands out for its efficiency in oxygen transfer. Due to this, the present study aimed to determine the effect of two types of aeration on water quality parameters and larval development of Litopenaeus vannamei in tanks for larviculture. A completely randomized design (CRD) experiment was carried out, with 2 treatments (artisanal hose - T1 and microporous hose - T2), each one by triplicate for a period of 10 days. Six tanks with a volume of 17 tons of water were used, which were stocked with 1’196.000 PL5 stage L. vannamei larvae (1,300 grams, with a PL/g count of 920). Throughout the experiment growth, survival, oxygen profile and water quality parameters such as dissolved oxygen (DO), pH, temperature and nitrogenous compounds were recorded. The results obtained showed that the tanks with microporous aeration had a final average weight of 2.48 mg and a survival of 84.3%, while the tanks with artisanal aeration had a final weight of 2.28 mg and a survival of 79%, indicating the treatment with microporous hose had a 8% and 6.71% greater growth and survival, respectively. Additionally, the tanks with microporous hose presented a more stable dissolved oxygen profile in the water column, all this is due to the smaller bubble size, which improves the transfer, distribution and solubility of DO, thus the shrimp larvae presented a lower energy expenditure and a better response of their physiological functions.