Production of Heterotic Hybrid in Rohu (Labeo rohita) Through Strain Crossing

Abstract

As a genetic means of aquaculture development, hybridization can increase production quickly in fishes because of heterotic effect. At the backdrop of reports on the decline of growth and reproduction of the hatchery population of Labeo rohita in Bangladesh, a 3 months study was undertaken to see the heterotic effect by intra-specific crossing among the Padma, Jamuna and Hatchery strains of rohu. Six reciprocal crosses and 3 pure crosses were obtained. The fertilization and hatching rates of the developing embryos were found better in the parental crosses than the reciprocal intra-specific hybrids. The growth performance of reciprocal crosses showed significant differences (P< 0.05) over the parental crosses. The best growth performance was observed in Padma ? X Jamuna ? hybrids; providing 72% positive heterosis. Since the growth rate of strain crossed hybrids were reasonably high, this technique can be profitably applied for the production of fast growing seed to ensure higher fish production and more profit.DOI: http://dx.doi.org/10.3126/ijls.v5i1.5035 International Journal of Life Sciences Vol.5(1) 2011 32-38

Study on freshness quality and post-harvest loss of Hilsa (Tenualosa Ilisha) during marketing in Mymensingh town, Bangladesh

“…Sunshine bass was a specific example of the cross of white and stripped bass, which was reported to grow faster than either parent (Smith 1988). Similar other results of strain crossing in different species worldwide were documented in the literature as of being capable to improve overall performance for aquaculture systems (Moav et al 1975, Ibrahim 1977, Kirpichnikov 1981, Senhorini et al 1988, Khan et al 1990, Salami et al 1993, Wohlfarth 1993, Bakos and Gorda 1995, Basavaraju et al 1995, Hulata 1995, Nwadukwe 1995, Knibb et al 1998, Reddy 2000, Islam and Shah 2007, Shah et al 2011). Combination of cross or breeding groups may inspire the likelihood of producing F 1 hybrids.…”

“…This might happen due to the adaptation of the strains at different ecological niche, which might weaken the natural viability of the gametes while artificially inseminated. Shah et al (2011) mentioned about lower rates of these estimators in strain crossing of other carp species rohu. Nevertheless, the lower rates of fertilization and hatching of the intra-specific hybrids in no way disqualify or dissatisfy the implications of strain crossing in this species.…”

“…The sex ratio of the spawners at '1 (male) : 2 (female)' was maintained. Female broods were treated with a double dose of 2 and 6 mg PG per kg body weight at 6 hours interval while male broods were given a single dose of 2 mg PG per kg body weight at the time of second administration to the female (Shah et al 2011). The stripping was done by applying gentle downward pressure with the thumb and index fingers from just below the pectoral fins up to the genital opening of the fish.…”

“…While the agriculture sector in Bangladesh has brought revolution in producing serials, pulses, fruits and vegetables etc. through hybrid seed technology, the fisheries sector cannot lag behind (Shah et al 2011). Therefore, aiming to fold the production of fishes higher is now a challenge, which can be feasible through inducing heterotic effect in the progeny.…”

Molecular and morphological evidence reveals hybridisation between two endemic cyprinid fishes

“…However, the two species utilise similar breeding grounds and spawn concurrently under similar environmental conditions (Tomasson et al ., ; Tweddle & Davies, ). Other species of Labeo have been shown to hybridise under natural and aquaculture conditions (Allu et al ., ; Shah et al ., ) and the similarity in spawning conditions could render this particular species pair susceptible to hybridisation. Indeed, L. capensis and L. umbratus are already known to hybridise at Hardap Dam in Namibia and suspected hybrids occur in the Caledon River (Orange River system) and the Gariep Dam on the Orange River system (Gaigher & Bloemhoff, ; Van Vuuren et al ., , ).…”