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Abstract
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Article Information:
Macrobrachium macrobrachion (Herklots, 1851) Class Structure and Sex Ratio in Luubara Creek, Ogoni Land, Niger Delta, Nigeria
S.N. Deekae and J.F.N. Abowei
Corresponding Author: Abowei Jasper
Submitted: 2010 June, 28
Accepted: 2010 July, 02
Published: 2010 October, 09 |
Abstract:
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Macrobrachium macrobrachion class structure and sex ratio was studied in Luubara creek of Ogoni
land in the Niger Delta area of Nigeria for a period of two years (January, 2006 to December, 2007). M ajority
of male shrimps were found in the 8 to 16 mm class. In 2006, the size class (8-16 mm) recorded 232 shrimps
and constituted 32.08% of the sample population. However, in 2007 most of the male shrimps occurred in the
12-16 mm class, (157 shrimps) and constituted 28.91% of the sample population. In the females, the dominant
size class was 8 to 16 mm. In 2006, a total of 324 females were observed in this size and this constituted
49.24% of the sample population. In 2007, a total of 170 female shrimps were obtained in the 8 to 12 mm size
class and this constituted 38.20% of the population. There were no female shrimps caught in the 24 to 28 mm
class during the study period. Amongst the berried females most of shrimps were found in the size class of 8-20
mm. In 2006 there were 274 berried females in the 8-12 mm group and this constituted 51.40% of the sam ple
population. In 2007 a total of 167 berried females w ere caught in 8-12 mm group and this constituted 47.87%
of the sam ple population. The sex ratios of shrimps in Luubara creek were variable. There were more females
than males. The overall male to female ratio was 1:1.6. It was only in the month of October 2006 that the
numbers of male were more than the female with a ratio of 1 male: 0.9 fem ale. The male to female ratio was
more than 1:2 in four months namely January, 2006 (1:2.9), June, 2006 (1:2.6), September, 2007 (1:2.7) and
October, 2007 (1:2.8). In other study months the male: female was less than 1:2. Only three months i.e. January,
2007, June, 2007 and July, 2007 had 1 male: 1 female ratio.
Key words: Class structure, luubara creek, Macrobrachium macrobrachion, Niger Delta, Nigeria, sex ratio, ogoni land
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Cite this Reference:
S.N. Deekae and J.F.N. Abowei, . Macrobrachium macrobrachion (Herklots, 1851) Class Structure and Sex Ratio in Luubara Creek, Ogoni Land, Niger Delta, Nigeria. Asian Journal of Agricultural Sciences, (4): Page No: 136-142.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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