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Abstract
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Article Information:
Some Age Related Attributes of Macrobrachium mcrobrachion (Herklots, 1851) from Luubara Creek in Ogoni Land, Niger Delta, Nigeria
S.N. Deekae and J.F.N. Abowei
Corresponding Author: Abowei Jasper
Submitted: 2010 June, 29
Accepted: 2010 July, 31
Published: 2010 September, 15 |
Abstract:
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Some Age related attributes of Macrobrachium mcrobrachion from Luubara Creek in Ogoni Land,
Niger Delta, Nigeria was studied for a period of two years (January 2006 - December, 2007). The age
composition of the shrimps estimated from the length-at-age data obtained from Paul’s integrated plots based
on the carapace length showed that; in 2006 males of one year plus represented 35.63% of the sample
population while two years plus constituted 55.17% of the sample population. Shrimps of three year plus
constituted 6.89% of the sample population while of four years plus represented only 2.29% of the sample
population. Shrimps less than one year were not observed. In 2007, male shrimps less than one year of age
constituted 32.09% of the sample population while those of one year plus constituted 44.44% or the majority
of the catch. Shrimps aged two years plus were 16.04% of the sample population and those of three years plus
were 7.40% of the sample population. There were no shrimps of more than four years during the study in 2007.
In 2006, there were no female shrimps below one year. Shrimps of one year plus constituted 24.77% of the
sample population; shrimps of two years plus constituted 62.83% of the sample population while shrimps of
three years plus constituted 12.38% of the population. There w ere no female shrimps of above four years in
2006. In 2007, there were also no shrimps above four years. Female shrimps of one year plus was 31.11% of
the sample population while those more than two years were 54.54% of the sample population. Female shrimps
of three years plus constituted only 14.28% of the sample population in 2007. In the berried female shrimps,
no shrimp was recorded below one year of age in 2006. Berried female shrimp within one year plus constituted
60% of the sample population while those of two years plus constituted 40% of the sample population. Shrimps
of three years age were not found. In 2007, no berried females shrimps caught were below one year. Shrimps
of two years plus constituted 70% of the sample population. The relative ages and modal lengths
(i.e., length - at - age) of M. macrobrachion obtained through Pauly’s Integrated distribution plots are showed
that the ages attained in males ranged from +1 year to 4 years while the female attained a maximum age of 3
years. It was observed that the growth in length was faster in the males than in females. The annual increment
of males was between 3-10 mm in 2006, while berried females had between 3-6.5 mm annual increments.
Individual growth also decreased according to age. Individual grow ths between two age groups were
considerably low.
Key words: Age, Macrobrachium mcrobrachion, Luubara Creek, Ogoni Land, Niger Delta, Nigeria,
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Cite this Reference:
S.N. Deekae and J.F.N. Abowei, . Some Age Related Attributes of Macrobrachium mcrobrachion (Herklots, 1851) from Luubara Creek in Ogoni Land, Niger Delta, Nigeria. Current Research Journal of Biological Sciences, (5): Page No: 313-322.
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ISSN (Online): 2041-0778
ISSN (Print): 2041-076X |
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