Abstract
ABSTRACT: The growth of cachama hybrids, cachamoto (Colossoma macropomum ♀ x Piaractus brachypomus ♂) and cachamay (P. brachypomus ♀ x C. macropomum ♂) was compared for 154 days to determine which showed the better productivity. The experiment was carried out in three earth ponds, each divided transversely with a plastic net, yielding six experimental units. Juveniles of cachamoto of 12.95±2.43g and 6.75±0.42cm and cachamay of 16.65±3.64g and 7.41±0.62cm were distributed in each sub-tank of 240m2 at a density of 0.5 fish m-2. Fish were fed twice daily except on days when their weight and length, and the physical and chemical parameters of the water were measured. The following productive variables were evaluated: growth in weight and length, daily weight gain, daily feed intake, apparent feed conversion, specific growth rate, condition factor, productivity and the cost/benefit relationship. None of the analyzed variables presented statistical difference between treatments. Physical and chemical parameters of the water remained within the recommended values for cachama, and survival was 100%. Based on the results obtained, it can be concluded that cachama reciprocal hybrids present a similar productive behavior, so that it is indifferent which one is chosen to be raised under the conditions evaluated.
Highlights
The south western region of Venezuela presents edaphic, hydrological and climatic conditions appropriate for the farming of warmwater continental fish
Since 1986, numerous farms have been established for the farming of the cachamas Colossoma macropomum and Piaractus brachypomus, and in recent years, almost 100% of the farms grow the hybrid of these species; uncertainty remains as to which of the two groups of reciprocal hybrids shows the better yield
The objective of producing hybrids of the two species of cachama present in Venezuela is to obtain individuals that show advantages of parents and that reflect in a higher productive yield
Summary
The south western region of Venezuela presents edaphic, hydrological and climatic conditions appropriate for the farming of warmwater continental fish. Since 1986, numerous farms have been established for the farming of the cachamas Colossoma macropomum and Piaractus brachypomus, and in recent years, almost 100% of the farms grow the hybrid of these species; uncertainty remains as to which of the two groups of reciprocal hybrids shows the better yield. Physical and chemical parameters of water, type and frequency of feeding and adaptation to the culture systems, among other conditions, are similar to parental groups (USECHE, 2001; GONZÁLEZ & HEREDIA, 1989). The objective of producing hybrids of the two species of cachama present in Venezuela is to obtain individuals that show advantages of parents and that reflect in a higher productive yield. Several studies have analyzed the growth of these hybrids of cachama
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