| Summary: | Appropriate feeding practices in pisciculture
consist in adjusting food ration according to the
requirements and phase of growth of the species to
cultivate, avoiding the loss of food and overfeeding. This
affects the survival of the fish, the physical-chemical
characteristics of the water and increases production
costs. With the objective to evaluate the influence of the
diets in the survival of cachamoto fingerlings and their
repercussion in the water quality, an assay was performed
in the Laboratory of Agricultural Zoology, in the University
of East Monagas Nucleus, Maturín, Venezuela, using 96
fingerlings with initial weight of 2.30 g, distributed in 12
clear glass aquariums, with useful capacity of 40 L, with
density of 8 fish/aquarium, providing four diets with two
protein levels 25 % and 45 %, respectively, with and
without phytoplankton. The feeding frequency was twice
daily, considering 10 % of the biomass adjusted to 7 %.
The results showed less mortality in diet 2 with 25 % of protein
plus phytoplankton (survival 100 %) and diet 1 with 25 % of
protein (survival 75 %). The highest mortality rate registered
was in diet 4 of 45 % of protein plus phytoplankton (survival 25 %) and diet 3 of 45 % of protein (survival 29 %). The
parameters of the water: temperature (29.25 ºC), total
dissolved solids (0.23 mg L-1), electrical conductivity
(0.47 μS cm-1) and pH (6.44) did not affect the survival
or water quality, staying within the acceptable limits for
the species, but the nitrites (2.76 mg L-1) and nitrates
(33.67 mg L-1) influenced in these two aspects. The
diet with 25 % of protein plus phytoplankton registered
greater survival and maintained the quality of the water
in the cultures of cachamoto fingerlings.
|
|---|