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Taxonomy and Other Biological Aspects of Rhinomugil Corsula (hamilton)

Shamima Sultana
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna-9208, Bangladesh

Md. Saifuddin Shah
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna-9208, Bangladesh

Shikder Saiful Islam
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna-9208, Bangladesh

Alokesh Kumar Ghosh
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna-9208, Bangladesh

Abstract/ Executive Summary:

The present study was conducted to obtain an idea on the taxonomy and other biological aspects like fecundity, gonadosomatic index, food and feeding habit, alimentosomatic index and hepatosomatic index of Rhinomugil corsula during December 2010 to March 2011. Total 130 specimens were assayed during the study period. The taxonomical study showed that the total length (cm), standard length (cm), head length (cm), length of upper jaw (cm), body depth (cm) and body weight (g) ranged from 19-24, 15-20, 3.1-4.6, 0.90-1.10, 3.20-4.50 and 64-124. The taxonomic formula for the species appeared like; D1. 4, D2. 7, P1. 13-14, P2. 5-6, A. 9/11, C. 18, RC. 4. Number of scales on, above and below the lateral line ranged from 46 - 49, 7 - 9 and 10 - 12. The biological investigation revealed that the fish weight (g), gonad weight (g), fecundity, GSI, liver weight (g), gut weight (g), alimentosomatic and hepatosomatic index and condition factor ranged from 100 - 202, 8.13 - 27.64, 8924 – 82642, 8.13 - 13.99, 0.96 - 2.00, 3.81 - 6.57, 2.78 - 5.06, 0.83 - 1.14 and 0.57 - 0.93. Present investigation indicated that the species is omnivorous in its feeding habits. The mean values of hepatosomatic and alimentosomatic indices indicated greater liver activity and feeding intensity. This study thus can be treated as an attempt for contribution of some information to this direction.

Keywords: Rhinomugil corsula, Taxonomic formula, Gonadosomatic index.

Location: Khulna, Bagerhat and Satkhira district

Start Date: 00-12-2010

End Date: 00-03-2011

Program Area: Animal Health and Management

Commodity: Marine fish

Objectives:

To obtain an idea on the taxonomy and other biological aspects like fecundity, gonadosomatic index, food and feeding habit, alimentosomatic index and hepatosomatic index of Rhinomugil corsula

Methodology:

Study area and period: The present study was carried out in the greater Khulna, Bagerhat and Satkhira district during December, 2010 to March 2011. Sample collection: A total of 150 specimens of R. corsula were sampled, of them, 50 female broods were subjected to fecundity estimation and gonadosomatic index determination, 50 for food and feeding habit determination and 50 samples for taxonomic study. After collection from the markets, the samples were immediately preserved in ice in plastic box and carried out to the Fish Biology Laboratory of Fisheries and Marine Resource Technology Discipline of Khulna University. Taxonomic study: Morphometric data measurement Eighteen morphometric characters viz., the total length, standard length, height of the body, head length, pre-orbital length, eye diameter, post-orbital length, pre first dorsal length, pre second dorsal length, length of first dorsal fin
base, length of second dorsal fin base, height of the first dorsal fin, height of the second dorsal fin, distance between first dorsal and second dorsal fin, least depth of caudal peduncle, length of caudal peduncle, length of anal fin base, length of pectoral fin and length of pelvic fin was recorded separately. The measurements were taken by using normal centimeter scale, fine pointed divider, forceps and slide calipers and recorded to the nearest cm. Meristic data counts: Ten meristic characters were recorded. These characters were recorded by counting the different parts of the body including scale on, above and below the lateral line, number of total fin ray of first dorsal, second dorsal, caudal, anal, pectoral and pelvic fins of the fish. Number of
rudimentary fin ray was counted separately. In case of counting scales above and below lateral line, the fraction of the scale was ignored because it was included in number of scale on the lateral line. Food and feeding habit: For food and feeding habit study, 50 fresh samples were collected randomly from local ghers and conditioned in varsity pond. Some days later they were catched from the ponds. The digestion of food items of fishes was stopped within few minutes by degutting the fish and preserving them in formalin. The fishes were dissected by giving a vertical incision on the ventral side. Guts and livers were removed, weighted and immediately preserved in separate numbered bottles containing 5% formalin solution. Hepatosomatic index: Fifty samples were used for recording hepatosomatic index. Hepatosomatic index was determined. Food items identification: Subsequently the contents of the stomach were analysed in the laboratory. The preserved guts of 30 live samples were used for food items identification. The preserved gut of each fish was dissected out and the contents of the stomach were removed very carefully in a Petri dish and then collected in glass vials making up the volume to 10 ml to determine the different food items eaten by the fish. After that, the food items were identified under a binocular microscope with the help of Sedgewick Rafter counting cell. Food particles were identified by investigating the external morphology. Attempts were made to identify the chief constituents of the stomach contents. Data analysis: All the data were arranged and analyzed. The data were then presented in tabular and graphical forms. In the present study, mean and range of each type of data and mean of ratio of some morphometric characters were estimated. Linear regression analysis was used to determine the relations between different characters of the species. SPSS 12.0 for windows software was used for statistical analysis.

Source of Information: International Journal of Research in Biological Sciences 2013; 3(3): 123-131

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The taxonomical study showed that the total length (cm), standard length (cm), head length (cm), length of upper jaw (cm), body depth (cm) and body weight (g) ranged from 19-24, 15-20, 3.1-4.6, 0.90-1.10, 3.20-4.50 and 64-124. The taxonomic formula for the species appeared like; D1. 4, D2. 7, P1. 13-14, P2. 5-6, A. 9/11, C. 18, RC. 4. Number of scales on, above and below the lateral line ranged from 46 - 49, 7 - 9 and 10 - 12. The biological investigation revealed that the fish weight (g), gonad weight (g), fecundity, GSI, liver weight (g), gut weight (g), alimentosomatic and hepatosomatic index and condition factor ranged from 100 - 202, 8.13 - 27.64, 8924 – 82642, 8.13 - 13.99, 0.96 - 2.00, 3.81 - 6.57, 2.78 - 5.06, 0.83 - 1.14 and 0.57 - 0.93. Present investigation indicated that the species is omnivorous in its feeding habits. The mean values of hepatosomatic and alimentosomatic indices indicated greater liver activity and feeding intensity. This study thus can be treated as an attempt for contribution of some information to this direction.

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