Production of cachama reciprocal hybrids in earth ponds

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.

The farming and husbandry ofColossoma macropomum: From Amazonian waters to sustainable production

“…The development of this hybrid, named ‘tambacu’, was aimed at combining the high growth rate of tambaqui and the low temperature tolerance of pacu. Similarly, the interspecific cross between two Amazonian characins, tambaqui and pirapitinga ( Piaractus brachypomus ), named ‘tambatinga’, was aimed at yielding better‐performance offspring 184‐187 . As the hybrids, a ‘secondary farmed type’, 188 started being produced in aquaculture, additional cytogenetic investigations were undertaken to understand the biological response and behaviour of chromosomes during mitosis and meiosis 189‐192 …”

“…Similarly, the interspecific cross between two Amazonian characins, tambaqui and pirapitinga (Piaractus brachypomus), named 'tambatinga', was aimed at yielding better-performance offspring. [184][185][186][187] As the hybrids, a 'secondary farmed type', 188 started being produced in aquaculture, additional cytogenetic investigations were undertaken to understand the biological response and behaviour of chromosomes during mitosis and meiosis. [189][190][191][192] The characterization of wild relatives and confined farmed types of tambaqui using isozymes started during the 1990s.…”