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Abstract
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Article Information:
The Composition, Ranking and Diversity of Callinectes amnicola (De Rochebrune, 1883) Food from Okpoka Creek, Niger Delta, Nigeria
A.D.I. George and J.F.N. Abowei
Corresponding Author: Abowei Jasper
Submitted: 2009 Sept., 04
Accepted: 2009 Sept., 24
Published: |
Abstract:
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The composition, ranking and diversity of Callinectes amnicola food from Okpoka creek was studied
for a period of two years (January 2006-December 2007). The total of nine hundred and thirty (930) stomachs
examined, five hundred and sixty representing (60.2%) had food items while three hundred and seventy (39.8%)
were empty. The highest percentage empty stomachs (80.0% ) were recorded in August 2007 while the lowest
(16.7%) was observed in March 2006. The food items observed in the stomachs were Crustacea, Pisces,
Mollusca, Annelids, plant materials, sand grains and unidentified masses. Crustacea consisted of shrimp parts
and crab appendages. Pisces consisted of fish flesh, fish scales and fish bones/spines. Mollusca consisted of
bivalve shells; bivalve tissues and gastropod shells while the plant materials were made up of higher plant parts
and algae cells. The ranking of the individual food items in the gastric stomachs of C. amnicola in a descending
order of magnitude using the three analytical methods show ed that, the frequency of occurrence method showed
that, bivalve shells scored (14.4%); closely followed by shrimp parts (13.4%) gastropod shells (12.6%), fish
bones/spines (11.9%), fish scales (10.6%) and crab appendages (10.1%). Annelids (1.6%) occurred the least.
The numerical method showed that, shrimp parts and bivalve shells were the highest by number with 13.2%
each; closely followed by fish bones/spines (12.6%), algae cells (11.0%) and gastropod shells (10.2%). Others
were fish scales (8.7% ), crab appendages (7.7%), sand grains (6.6%) and fish flesh (4.7% ). Annelids were the
least in occurrence with 1.3%. Bivalve shells (14.6%) scored the highest point, closely followed by shrimp parts
(14.%) and then fish bones/spines (13.9%). The lowest point was scored by annelids (1.9%). (7.7%), sand
grains (6.6%) and fish flesh (4.7%). The result shows a high diversity in food intake. The diversity indexes (H
and J) estimated, revealed high diversity (H = 1.0186) in food intake with relative diversity or evenness
(J = 0.9144) approaching one (1).
Key words: Callinectes amnicola, food, composition, composition, ranking, diversity, Okpoka creek, Nigeria
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Cite this Reference:
A.D.I. George and J.F.N. Abowei, . The Composition, Ranking and Diversity of Callinectes amnicola (De Rochebrune, 1883) Food from Okpoka Creek, Niger Delta, Nigeria. Advance Journal of Food Science and Technology, (1): Page No: 12-18.
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ISSN (Online): 2042-4876
ISSN (Print): 2042-4868 |
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