Assessment of fecundity of Brycinus macrolepidotus in Akomoje water reservoir, Abeokuta, South West, Nigeria
Egyptian journal of aquatic biology and fisheries(2019)
摘要
Overfishing and threat of extinction globally has been a topic of
concern in the fisheries sub-sector over the years. This study assessed
some aspect of the biology of Brycinus macrolepidotus in Akomoje
reservoir, lower River Ogun, Nigeria. A total number of 838 fish
specimens were collected bi-monthly for a nine month period from
commercial catches using cast nets and long line. A total number of 51
mature female were selected for fecundity analysis which was limited to
only sexually gravid female fish. Length and weight of experimental fish
were measured. Data were subjected to analysis of variance (ANOVA),
descriptive and inferential statistics. Correlation statistics was carried out
to ascertain relationship between absolute and relative fecundity with
length and weight of fish. Length and weight of experimental fish ranged
between 14.5-39.4 cm and 938-1956 g. The relative fecundity ranged
between 441 and 3,597 eggs with a mean of 1,702±0.16 eggs while
absolute fecundity ranged from 5,838 to 39,208 eggs with a mean of
14,326±0.52 eggs. Strong positive relationship existed between total length
and absolute fecundity (r= 0.74), and relative fecundity (r = 0.81). The
reproductive potential of the species in this water body showed the
ecological suitability of the species to its environments and to its thriving
fisheries. The skewed sex ratio observed is an indication of threat to the
species abundance in the lower River Ogun. Therefore, the habitat should
be monitored towards sustainable methods of managing the stock in the
reservoir.
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关键词
brycinus macrolepidotus,akomoje water reservoir,nigeria
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