Propagation, growth and haematology of Clarias gariepinus bred and reared in water from a natural stream at 5o28’N, 7o32’E (Nature stream) and two wells at 5.4810N, 7.5370E (well-1) and 5.4770N, 7.5390E (well-2) were studied. The study was carried out in search of suitable water within close proximity for fish propagation. Growth was evaluated once in two weeks. Haematological parameters of the fingerlings were examined at 70 day post hatch. There was significant difference (P<0.05) in egg fertilization, hatchability, larval survival, growth and blood parameters among the treatments. Fish exposed to water from the natural stream impacted best propagation indices including fastest growth and highest values of Packed Cell Volume (PCV) and Mean Corpuscular Haemoglobin Concentration (MCHC). Fish for well-1 and well-2 were not statistically different (P>0.05) in PCV and MCHC. Apart from these two parameters, values of all the other blood parameters including growth were significantly lower (P<0.05) in fish for well-2 than those for well-1. The disparities observed signifies differences in water quality which is indicative for the presence of contaminant not identified in this study. The report recommended inclusion of heavy metals and organic mineral analysis in future study to identify the cause of the observed alterations.
Administration procedures of some hormones including single, double and multiple induction protocols were investigated to determine the implications of different induction process in propagation of Clarias gariepinus. The hormones studied were ovulin, Carp pituitary extract (CPE) and gonopore. A total of 36 Clarias gariepinus of the same age comprising 27 females and 9 males were used for the study. Eggs produced among treatments were fertilized with pooled sperm from a total of 3 males per hormonal treatment. Propagation was assessed by fecundity, fertilization, hatchability and larval survival. Highest egg production was recorded at double inductions with ovulin and CPE while highest egg production was observed in single induction with gonopore. There was significant disparity (P<0.05) in fertilization and hatchability percentages. Best fertilization and hatching rate was recorded with ovulin at single induction (80.2%) and ovulin at multiple inductions (81.9%) respectively. There was significant difference (P<0.05) in number of larvae realized among the treatments. Highest larval survival was recorded with gonopore at single induction (68.1%). Findings from the study showed that hormone type and mode of administration are important in propagation of C. gariepinus. The study recommended double inductions in usage of Ovulin and CPE and single induction with gonopore. Adopting best procedural technology in usage of specific hormone is necessary for mass production of Clarias gariepinus seeds.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.