ARTIFICIAL HYBRIDIZATION OF CLARIAS GARIEPINUS AND HETEROBRANCHUS LONGIFILIS
ARTIFICIAL HYBRIDIZATION OF CLARIAS GARIEPINUS AND HETEROBRANCHUS LONGIFILIS
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Date
2011-02
Authors
YISA, NDAGI SILAS
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Abstract
Intergeneric hybridization studies of Heterobranchus longifilis and Clarias gariepinus
were carried out at the Fish Biotechnology Programme of National Institute for
Freshwater Fisheries Research (NIFFR), New Bussa, Niger State, Nigeria with the
aim of identifying the mating combination with the best performance in terms of
hatchability, survival and growth. Four mating combinations were generated from H.
longifilis and C. gariepinus and were successfully induced under controlled hatchery
condition. The percentage hatchability showed no significant difference (P>0.05)
between the mating combinations. However, the highest percentage hatchability of
56% was recorded in female Clarias gariepinus and male Heterobranchus longifilis
and the least of 40% was recorded in parental Clarias gariepinus. The percentage
indoor survival showed no significant difference (P>0.05). But the cross involving
the intergeneric crosses gave the highest survival of 86% and parental of H. longifilis
gave the least of 75%. However, the outdoor survival after 8 weeks rearing also
showed no significant difference (P>0.05). However, female Clarias gariepinus and
male H. longifilis gave the highest survival of 91.5% and the parental crosses gave the
least of 71.5%. The 14 days growth indoors showed significant difference (P<0.05) in
final pooled weight. Highest final pooled weight (9.0g) was obtained in parental C.
gariepinus and the parental H. longifilis gave the least (4.57g). There was no
significant difference in their length. The eight weeks outdoor growth performance
also showed significant difference (P<0.05) between the crosses. Maximum final
pooled weight (293.75g) was observed in H. longifilis, while female H. longifilis and
male C. gariepinus gave the least final pooled weight (219.00g). There was no
significant difference (P>0.05) in length between the crosses in the Outdoor rearing.
In this study, the inter-generic cross between female Clarias gariepinus and Male
Heterobranchus longifilis gave the best growth performance while in the intraspecific
cross Heterobranchus longifilis parental group gave the best growth
performance.
Description
A THESIS SUBMITTED TO THE SCHOOL OF
POSTGRADUATE STUDIES, AHMADU BELLO
UNIVERSITY, ZARIA FOR THE AWARD OF MASTERS OF
FISHERIES
(M. SC. FISHERIES) DEPARTMENT OF BIOLOGICAL
SCIENCES, FACULTY OF SCIENCE,
AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA.
FEBRUARY, 2011
Keywords
ARTIFICIAL, HYBRIDIZATION, CLARIAS GARIEPINUS, HETEROBRANCHUS LONGIFILIS