Digestible energy requirement for females of Rhamdia quelen on reproductive activity fed with ration based on vegetal ingredients

Robie A Bombardelli,Lucélia Tessaro,Fábio Meurer,Cleide V.B Martins,Alexandre H Buzzi,Eduardo A Sanches

doi:10.3856/vol43-issue3-fulltext-18

Abstract

The present experiment was carried out to evaluate the growth and reproductive parameters of Rhamdia quelen females fed with pelleted ration containing different levels of digestible energy, and to evaluate the vigor of their offspring. The breeders were placed in tanks under conditions of photoperiod and natural temperature. The fishes were fed for 255 days with isoproteic rations pelleted containing 35% of crude protein (CP) and five levels of the digestible energy (DE) (2700, 2950, 3200, 3450, 3700 kcal kg-1). The fishes were distributed in a randomized experimental design compounded by five treatments and three repetitions. A 16-m2 tank containing six females and three males was considered as one experimental unit. The weight and weight gain was evaluated. During the reproductive season the females were induced to breeding by hormonal manipulation and were evaluated the percentage of spawning females, the total fecundity, relative fecundity (number of oocytes per gram of spawning females), the fertilization ratio, the time to hatching and the vigor of larvae. The growth and reproductive parameters were not influenced (P > 0.05) by the increasing levels of digestible energy of the rations. The feeding of R. quelen females in breeding fit can be carried out with 2700 kcal kg-1 pelletized ration based on vegetal ingredients, without damage to reproductive performance.

Highlights

The nutrition has always shown its value to the aquaculture, in view of its influence on growth and on the quality of the meat (Santos & Oba, 2009)
Treatments were constituted by the individuals feeding with diets containing 35% of crude protein (CP) and 2700, 2950, 3200, 3450 and 3700 kcal digestible energy (DE) kg of ration-1 (Table 1)
Information about the environmental requirements to guarantee the suitable development of silver catfish suggests that the physical and chemical variables of the water remained into the bounds recommended to the suitable development of the specie (Baldisserotto & Radünz-Neto, 2004)

Summary

Introduction

The nutrition has always shown its value to the aquaculture, in view of its influence on growth and on the quality of the meat (Santos & Oba, 2009). Attention is given to the knowledge of the direct or indirect influence of nutrition on the reproductive performance of fresh water fishes (Izquierdo et al, 2001), due the expressive growth of the Latin America aquaculture in recent years (FAO, 2012). In this set, where fishes constitute the main group reared and their production have been increased 97% between 2003 and 2009 in some countries (Lopera-Barrero et al, 2011), it is verified the imminent necessity of guarantee the production of offspring in quantity and quality to attend the productive demand (Bombardelli et al, 2009). The diet composition can influence the reproductive physiology (Navas et al, 1998), limiting the juveniles production in quantity and quality (Izquierdo et al, 2001)

Methods

Results

Conclusion