Abstract
The aim of this study was to evaluate the zootechnical performance and chemical composition of jundia juveniles Rhandia voulezi fed with mash, pelletized and extruded diets and cultivated in cages. One hundred and fifty fish were distributed in fifteen cages (0.20 m³), arranged in cages (5m³), in the hydroelectric plant of Governador Jose Richa, in Iguacu River (Parana-Brazil). The fish were fed five times a day, with mash, pelletized and extruded diets, containing 30% of protein and 3250 Kcal/kg of digestible energy/kg. At the end of 60 days, significant differences (p<0.05) were observed on fish performance. The fish that were fed with pelletized diet, presented higher average of final weight (44.08g), final length (16.51cm) and weight gain (36.65g). The different processes did not influence fish survival. The averages of protein and mineral matter of carcass chemical composition did not differ statistically (p<0.05), while the values of humidity and lipideos presented differences among treatments. The highest average of lipideos (8.59%) was observed in peletized diet. The mash diet provided fish with lower lipideo (5.45%) and higher humidity (75.98%) rates. A pelleted diet is most suitable for juvenile catfish R. voulezi cultivation in cages. KEYWORDS: Aquaculture; feeding; native species.
Highlights
Rhamdia voulezi fish is an endemic species of the Iguaçu basin which belongs to the class of Osteichtyes, order of Siluriformes, and Heptapteridae family (BOOCKMANN & GUAZZELLI, 2003)
Among various factors related with fish rearing, food is responsible for most part of the production cost in intensive aquaculture
The low dissolved oxygen (3.73 ± 0.37 mg O2D L-1) observed may be explained by the type of experimental net cages, made of shade net, which possibly reduces the passage of water through clogging
Summary
Rhamdia voulezi fish is an endemic species of the Iguaçu basin which belongs to the class of Osteichtyes, order of Siluriformes, and Heptapteridae family (BOOCKMANN & GUAZZELLI, 2003). A study assessing the economic performance of tilapia rearing under intensive production system showed that the feed was the item with the largest share in production costs, 41.07% of the total (CRIVELENTI et al, 2006), whereas the monoculture of common carp (Cyprinus carpio) generates a ratio of 38% (GRAEFF, 2004) In this context, diet processing is important as it aims to facilitate the feed intake by the fish, increasing feed efficiency and reducing losses to the aquatic system (RODRIGUES & FERNANDES, 2006), besides improving the nutritional value, the acceptance and the stability of the feed in water
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