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Abstract
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Article Information:
Macrobrachium macrobrachion (Herklots, 1851) Morphology and Abundance in Luubara Creek, Ogoni Land, Niger Delta, Nigeria
S.N. Deekae, J.F.N. Abowei and A.D.I. George
Corresponding Author: Abowei Jasper
Submitted: 2010 July, 01
Accepted: 2010 July, 30
Published: 2010 October, 09 |
Abstract:
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Macrobrachium macrobrachion morphology and abundance in Luubara creek, of Ogoni Land, in
the Niger Delta region of N igeria was studied for a period of tw o years (January, 2006 to December, 2007). It
was not different from other Macrobrachium species. The body is divided into three main divisions: the head,
thorax and abdomen. The head and thorax are joined to form a cephalothorax, containing the mandibles,
flagella, rostrum and the eyes containing a stalk containing five pairs of walking legs. The abdomen contains
six body segments with last segment bearing a uropod (telson). The other five segments bear swimming
apparatus (swimmerets). The second walking legs are modified to form the chelae and distinctively colored
either blue or brownish colors. The legs contain hairs (furs). Mature males are considerably larger than females.
The second walking leg of the male is thicker. Cephalothorax is also proportionally larger in the male than
female while abdomen is narrower in the female. Genital pores of the male are between the bases of the fifth
walking leg. The female genital pores are at the base of the third walking legs. Abdomen pleura are lower and
the abdomen broader in female than male. Female pleura form a brood chamber that caries eggs between laying
and hatching. A ripe ovigerous female can easily be identified with large orange-colored mass ovaries
occupying a large portion of the cephalothorax. Station 1 had total 385 shrimps in 2006 and in 2007 the total
number of shrimps was 246. The highest number of female shrimps was recorded in March 2006 while no
shrimps were observed in September 2006. The least number of females was recorded in October 2006 and in
September and October 2007. The least number of males was recorded in June 2006 and in September, 2007;
while the highest number of males was in February, 2006 and January 2007. In terms of sex ratio, the females
were more than males (1:1.6). The total number of shrimps obtained in station 2 was 1,006 out which 378 or
35.57% were males while 628 or 62.42% were females. In station 2, the highest number of shrimps was
recorded in January 2006 while the lowest was in September 2006. Also in 2006, highest number of males was
recorded in January while the least number of males was in September. In 2007, the highest number of males
was recorded in January, 2007 and the least in October. The highest number of females was recorded in March,
2006 while the month of December, 2006 recorded the least number of females. In 2007, the highest number
of females was in October, while the lowest number of females was in April. Other species recovered from the
trap were Macrobrachium vollenhovenii, M. equidens, Hemichromis fasciatus, Tilapia guineensis and
Sarotherodon melanotheron. Station 3 recorded the highest number of shrimps obtained during the study
period. There w ere 1,603 shrimps out of which 597 or 37.24% were males while 1007 or 62.75% were females.
In 2006 the highest number of males w as obtained in March w hile the least number of males were recorded in
December, 2006. In females, the highest number was recorded in January 2006, while the lowest number of
females was recorded in December, 2006. In 2007, the highest number of male shrimps was obtained in January
while the lowest number was obtained in October 2007. For the females, the highest number was obtained in
February while the least number of females was obtained in April, 2007.
Key words: Abundance, Luubara creek, Macrobrachium macrobrachion, morphology, Niger Delta, Nigeria, Ogoni land
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Cite this Reference:
S.N. Deekae, J.F.N. Abowei and A.D.I. George, . Macrobrachium macrobrachion (Herklots, 1851) Morphology and Abundance in Luubara Creek, Ogoni Land, Niger Delta, Nigeria. Asian Journal of Agricultural Sciences, (4): Page No: 143-149.
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ISSN (Online): 2041-3890
ISSN (Print): 2041-3882 |
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