Olivera, A., Alfonso, E., Beltrame, E.
Abstract:
Feeding is one of the most important factors governing the success of
shrimp post-larval production. About this aspect there is little
information referring to Penaeus schmitti early postlarvae. With the
purpose to know the effect of the stocking densities in relation to the
food quantities an experiment was carried out in P. schmitti PL5 to
PL10.
A 3 x 3 factorial design considering three percentages of a
microencapsulated artificial diet: 50, 75 and 100 % (over PL dry
weight) and three stocking densities: 40, 70 and 100 PL/l was
performed. Three repetitions for each combination (27 experimental
units) were conducted and a simultaneous pattern of a traditional
larviculture process using Artemia nauplii and artificial plankton was
also considered.
In order to analyze the results the survival and the PL10 sizes have
been compared using ANOVA, Duncan Test and Multiple Regression
Analysis (P<0.05). The higher survival was obtained with 50% of
feeding rate, there were no differences for the three stocking densities
tested. In general, it was observed that densities of 40 PL/liter
presented a biggest PL10 sizes, independently to the feeding rate.
Significative differences were detected in PL survival for the feeding
rate/stocking density interactions. The Regression Analysis (R^2 =
0,85) shows a significant interaction between diet percentages and
stocking densities to the animal sizes.
It was confirmed that under tested conditions, the effect of feeding
rate was of secondary importance compared with the stocking density
in relation to the growth of the animals.
(Laboratorio de Camaroes Marinhos, Centro de Ciencias Agrarias,
Universidade Federal de Santa Catarina, P.O.Box 476, CEP 88040-
970 Florianopolis, SC, Brazil)