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Seasonal Variation of Length-weight Relationship and Condition Factor of Amblypharyngodon Mola in Dekar Haor Under Sunamganj of Bangladesh

Poly Rani Das
Department of Aquaculture, Sylhet Agricultural University, Sylhet, Bangladesh

Md. Shahab Uddin
Department of Aquaculture, Sylhet Agricultural University, Sylhet, Bangladesh

Md. Shahidul Islam
Department of Coastal and Marine Fisheries, Sylhet Agricultural University, Bangladesh

Mithila Biswas
Department of Coastal and Marine Fisheries, Sylhet Agricultural University, Bangladesh

Abu Saleh Md. Arif
Department of Aquaculture, Sylhet Agricultural University, Bangladesh

Abstract/ Executive Summary:

The present study investigated the length-weight relationship and condition factor of 2000 Amblypharyngodon mola from Dekar haor, Sunamganj during January to October 2017 except March and June on seasonal basis. The range of regression coefficient value ‘b’ varied from 2.798-3.852 for male and 2.603-3.222 for female indicated that both sexes showed allometric pattern of growth. In overall, ‘b’ value for both sexes was almost similar trend in all the seasons and indicated that both sexes did not follow the cube law (b=3) strictly. The lowest ‘r’ value (0.884) was recorded in post-monsoon and the highest (0.911) in winter for male, while minimum ‘r’ value (0.809) was observed in premonsoon and maximum (0.898) in monsoon for female. Values of correlation coefficients ‘r’ showed a significant (p<0.001) positive relationship between length and weight of the fish. Condition factor ‘K’ was the highest (1.302) in pre-monsoon for male and the lowest (0.897) in winter, whereas for female, it fluctuated from 0.931 (winter) to 1.213 (pre-monsoon). Therefore, the results of the present study provides the first baseline information on length-weight relationships of mola based on season, which may be useful for sustainable management and conservation of the mother stock of Dekar haor ecosystem.

Keywords: length-weight relationship, Condition factor, Amblypharyngodon mola

Location: Dekar Haor under Sunamganj of Bangladesh

Start Date: 00-01-2017

End Date: 00-10-2017

Program Area: Animal Health and Management

Commodity: Mola/Dhela/Dankina

Objectives:

Very few studies were conducted on the length-weight relationship of mola on the basis of seasonal variation in Dekar haor even in Bangladesh. This study will help researchers, students, and teachers to work with new species according to its guidelines. Therefore, the present study aimed to provide information to reduce the probable depletion of their wild stocks in the future and their proper management and conservation strategies.

Methodology:

2.1 Study area and period The study was conducted in Dekar haor of Dakshin Sunamganj, which lies between latitude 24°46´N to 24°57´N and longitude 91°20´E to 91°31´E. Fish sample collection was done for eight months from January 2017 to October 2017 except March and June. These eight months were divided into four seasons namely winter (January-February), pre-monsoon (April-May), monsoon (July-August) and post-monsoon (September-October). Samples were collected twice in a month at 15 days intervals.

2.2 Collection of sample A total of 2000 samples were collected randomly. After collection, the samples were transported to the laboratory in a large polyethylene bag with 5% formalin. Then washed and transferred to a filter paper to remove excess water from the body surfaces.

2.3 Measurement of length-weight Total length of fish was measured from tip of the snout to end of the tail using measuring scale (cm) and weight upto 0.1 g using digital weighing balance, respectively.

2.4 Length-weight relationship The statistical relationship between length and weight was established by the parabolic equation given by Froese [8], W = aLb , Where, W = weight of fish (g), L = length of fish (cm), a = constant and b = a regression coefficient expressing relationship between length-weight. The relationship (W = aLb ) was converted into logarithmic form of equation giving a straight line relationship graphically, Log W=Log a + b LogL. The equation is same to Y= a + bX, where, Log W= Dependent variable (Y), Log L= Independent variable (X), b= Regression coefficient or slope, a= Intercept.

2.5 Condition factor ‘K’ Condition factor ‘K’ was calculated by Fulton’s [9] equation, K= W ×100/ L3, where, K= Condition Factor, W= Observed body weight (g), L= Observed length of fish (cm). 2.6 Statistical analysis Data were analyzed using Microsoft Office Excel and SPSS software (Version 20) with p<0.001 considered significantly different.

Source of Information: International Journal of Fisheries and Aquatic Studies 2018; 6(2): 449-454

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study indicates that length-weight relationship of A. mola exhibits strongly positive correlation in all seasons and the value of regression coefficient does not follow the cube law strictly, which indicates allometric growth. The length and weight of fishes remains less in winter and premonsoon. The highest length, weight and number of females were also found to increase from pre-monsoon to monsoon. Therefore, it can be concluded that the existing hydrobiological conditions of the haor are conducive for the feeding and optimum growth of the fish. The outcomes of the present study has also provided new and updated information on the length-weight relationship and condition factor of A. mola based on season in Dekar haor, Dakshin Sunamganj, Bangladesh. Seasonal variation of length-weight relationship of mola is presented for the first time in Dekar haor even in Bangladesh. It is assumed that this knowledge will open a new chapter for the new researchers and teachers, who are interested to work on small indigenous species (SIS) of Bangladesh. Information derived from the present investigation will play an important role in management and conservation of this species.

Knowledge Management: Journal