SOME BIOLOGICAL ASPECTS OF PORCUS BAYAD IN TIGA DAM LAKE, KANO STATE
SOME BIOLOGICAL ASPECTS OF PORCUS BAYAD IN TIGA DAM LAKE, KANO STATE
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Date
1988-09
Authors
ABDULLAHI, SHUAl'BU AKPAI
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Journal ISSN
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Publisher
DEPARTMENT CF BIOLOGICAL SCIENCES, FACULTY OF SCIENCES AHMADU BELLO UNIVERSITY, ZARIA.
Abstract
Investigation in to aspects of the biology of
Porcus bavad (ptaff) in Tiga dam lake were conducted
between August, 1986 and July 1987. Samples were
obtained from commercial fish landings in Tiga,
Rurum and Bagauda beside the dam twice or thrice
monthly, during the period of investigation,
A total of 510 Specimens were examined of which
336 (65.9%) had fed and 174 (34.0%) had empty stomachs.
The fish was Piscivorous, however those below 30cm
standard length were predominantly omnivourous feeding
on fishes, insects and plants while the larger ones
above 30cm were typically piscivorous feeding on Alestes
spt synodontis sp and Tilapia sp.
The length - weight regression analysis indicated
positive allometrie growth. The standard length of the
specimens ranged from 12.0cm to 57.2cm for males, while
that of the females ranged from 11.8cm to 55.0cm. The
weight of both sexes ranged from 81.Og to 1716.Og.
Size distribution studies showed that the females were
smaller than the males.
The mean condition factor determined were found to
be high for most part of the period of investigation.
Out of a total of 510 specimens examined, 311 were males
and 199 were females. The fish showed a well defined
peak in the breeding activity from May to August. The
mean fecundity estimate was 4,726 + 690.
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Keywords
BIOLOGICAL, ASPECTS, PORCUS, TIGA