Abstract
Abstract
The present study aimed to improve the growth rate of the Bangladeshi native climbing perch (
Anabas testudineus
) through crossbreeding with Vietnam‐originated climbing perch, which is commercially cultured in Bangladesh. Therefore, crossbred between native and Vietnam strains of
A. testudineus
were evaluated in the first year (F
1
) as T
1
—Native ♀ × Native ♂, T
2
—Vietnam ♀ × Vietnam ♂, T
3
—Native ♀ × Vietnam ♂, and T
4
—Vietnam ♀ × Native ♂. In the second year (F
2
), backcrosses were performed between native and F
1
generations as T
5
—Native ♀ × F
1
(T
3
) ♂ and T
6
‐F
1
(T
3
) ♀ × Native ♂ following five replicates in each treatment group. The F
1
crossbreds of T
4
were irregular in size with low survivability than T
3
, and therefore were not used as a parent in the second‐year backcross experiment. The breeding performances were reduced in the T
4
(F
1
) and T
6
(F
2
) compared to purebreds (T
1
and T
2
). The specific growth rate (0.75%/day) of T
5
and T
6
was substantially lower than T
3
and T
4
but was considerably superior to the T
1
and T
2
purebred. The heterosis effect was highly evident in T
6
(27.94%), whereas negative heterosis was determined in the crossbreds of the F
1
generation (T
4
). Ten morphometric characteristics were compared and the caudal fin length, pectoral fin length, eye diameter, and body depth were responsible for the variation among T
1
–T
6
groups by the second principal component. Furthermore, the results showed that the Bangladeshi native female climbing perch is linked with better breeding performances, and the Vietnam strain male is linked with better growth performance. Finally, the current breeding programme could enhance native climbing perch growth and survivability, which may have aquaculture potential and can be used through careful artificial selection on the commercial farm.
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