Study Compared by the Embryonic Metamorphosis of Hoplobatrachus occipitalis (Gunther on 1858) in Checked (Controlled) and Natural Environment in the District of the Lagoons of Ivory Coast
Keywords:
amphibian, Hoplobatrachus occipitalis, larval breeding, metamorphosis, laboratory, pond .Abstract
A study on the metamorphosis of Hoplobatrachus occipitalis larvae was carried out in pond and laboratory from June to September 2016. 60 larvae from natural eggs were bred from 30 individuals in an aquarium and 30 others in appas. These larvae were fed artificial food throughout the test period. Comparisons made at measurement level showed that larval growth was greater in ponds than in the laboratory; the averages obtained were 5,70 ± 0,04 cm and 4,90 ± 0,07 cm for the length of the tail and 8,12 ± 0,01 cm and 7, 25 ± 0,07 cm for the total length. Then, the changes that occurred in these animals in the middle showed that the eyes and hind legs of the larvae appear before their nostrils and forelegs. In fact, the average number of days of appearance of the eyes and hind legs was 29.5 days in ponds and 32.5 days in laboratories, compared with 52.5 days and 55.5 days for nostrils and anterior legs. Finally, the mortality rate observed during rearing was lower in ponds (20%) than in (33.33%) laboratories.
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