Growth and survival of diploid and triploid bata, Labeo bata (Hamilton, 1822)

Abstract

Bata (Labeo bata), an indigenous, freshwater minor carp, is a great delicacy in Bangladesh. In its natural fishery, bata contributes significantly to the health and nutritional security of a large section of the fisher communities in Bangladesh. However, it is not a popular farmed fish because of its small size and slow growth rate. The induction of triploidy, aimed at providing faster growth and larger body size, could be appropriate for L. bata to enhance its aquaculture potential. In the present study, we induced triploidy in L. bata by applying heat shock on fertilised eggs (that were maintained at the ambient temperature of 26-28 • C), 3 to 5 min post fertilisation and for durations ranging from 1 to 2 min. Four different temperatures, namely, 38, 39, 40 and 41 • C, were tested as heat shock treatments. The optimum treatment combination for triploidy induction in L. bata was found to be 39 • C for the 1 min duration, 3 min after fertilisation, yielding 100% triploidy. Karyotyping revealed 72 chromosomes in the triploid fish (3n), whereas the diploid control (2n) had 48 chromosomes. The growth performance of the triploid hatchlings was compared against the diploid control in experimental ponds.After 12 weeks of rearing, the triploid fish were significantly heavier (p < 0.05) than their diploid counterparts. The survival rate of the triploids was also better (69%) than that of diploids (56%). Overall, results revealed better performance (growth and survival) of triploid bata over diploids, indicating that the farming of triploid bata can be a viable practice in Bangladesh.

Effects of Salinity on Physiological, Biochemical and Gene Expression Parameters of Black Tiger Shrimp (Penaeus monodon): Potential for Farming in Low-Salinity Environments

“…P. monodon is a major coastal aquaculture species in South-east Asia where it contributes significantly to the economy of many countries [27,28]. For example, Bangladesh earned ≈$US 300 million by exporting 29,000 metric ton (MT) of P. monodon; currently, it is the second-largest export earning source for the country [29,30]. P. monodon is a marine (euryhaline) species, but naturally tolerates a wide range of salinity levels (5-35‰) [5].…”

Effects of ammonia on the cellular, physiological, biochemical and genetic traits of Indian major carp (Labeo rohita) fry in artisanal Bangladeshi aquaculture

“…Feed may remain an issue due to nutritional constraints on the species being cultured, but the latter two methods for reducing ammonia should be easily applied (Constable et al., 2003). However, in many farms of developing countries, uncontaminated water and/or facilities for sufficient aeration are unavailable (Afroz et al., 2021; Rahi & Shah, 2012b). Therefore, the negative effects of higher levels of ammonia in developing countries pose challenges for many aquaculture species.…”

Cellular, Physiological, and Biochemical Basis of Adaptive Response to Variable Osmotic Environments by the River Shad, Tenualosa ilisha

“…As a migratory species, ∼0.3 million ton hilsa is harvested in the freshwater river systems after spawning (postmonsoon season) while majority of the total hilsa is harvested across the coastal rivers (brackish waters) and sea throughout the year [5]. However, the production of the upstream migratory rivers remained stable or even decreased due to the disruption of migratory routes by heavy siltation, loss of spawning, feeding, and nursing grounds, the indiscriminate catching of juveniles, and an increased fshing of adults [1,6].…”