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On the Fecundity and Sex-ratio of Labeo Bata (hamilton) (cypriniformes: Cyprinidae)

Md. Abdur Razzaq Joadder
Fisheries Research Laboratory, Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

Climate change is no more an environmental concern it has emerged as biggest developmental challenge for the most vulnerable Bangladesh. The whole international community is also scared of catastrophic adverse effects of future climatic changes on different spheres of man and nature, e.g. deglaciation and sea level changes, submergence of lands, nations and major coastal lowlands, atmospheric dynamics including evaporation and precipitation, global radiation balance, photosynthesis and ecological productivity, plant and animal community and many more. This paper tries to focus the adverse impacts of climatic changes on the crop production, food security, yield gap and sustainable agriculture by crop intensification and diversification. The impact of climate on agriculture could result in problems with food security and may threaten the livelihood activities upon which much of the population depends and thrives. Hilly committed research efforts showed technological progress as evidenced by release of 684 high yielding varieties of various crops and about 769 management technologies by NARS institutes, and universities. The greatest challenge for the future agriculture under climate change, we need improved and modified warning system, developed climate impact modules, build sufficient resilience of food system, comprehensive climate resilience strategies, develop database on climate. Also need top priority to mitigate the impact of climate change on agriculture through weather services, more research and extension service, agro advisories, insurance, community bank, intensify and diversify crop production system, modern high yielding varieties and management technologies for future sustainable agriculture.

Keywords: L bata, fecundity, sex-ratio

Location: Rajshahi

Start Date: 01-02-2007

End Date: 31-01-2009

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To determine the index of density dependent factor affecting the population size of a fishery.

Methodology:

A total of 2200 specimens of L bata were collected at random from different place in Rajshahi during the period from February 2007 to January 2009.Of the collected samples 1263, were females (660 non-gravid and 603 gravid) and 937 were males. 234 gravid females were studied for estimation of fecundity. The collected fish samples were brought to the fisheries research laboratory for further studies and analysis. In the laboratory total length of fishes were measured to the nearest mm by means of a measuring board and their weights were recorded to the nearest g by a electronic balance (A&D co. ltd. Korea). After opening the abdomen, gonads were taken out intake and moisture was thoroughly wiped out from ovaries by blotting paper and preserved in 70% alcohol solution. Gravimetric method was used for the estimation of the fecundity. The method was followed by many workers.

Source of Information: Journal of Science Foundation, 2013;11(2):43-48]

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was observed in the present study that the fecundity varied from 51,354( for a fish with total length of 127.3 mm and total body weight of 20.0 g) to 91,568( for a fish with total length of 256.6 mm and total body weight of 156.70 g) respectively. The mean fecundity was obtained to be 67,617.50±13,510.15 for the average length and weight of 192.98±41.06 mm and 87.79±49.07 g, respectively .The mean total length of gonad was 67.62± 24.01 mm against the mean total weight of gonad of 20.35±13.50 g. During the experiment the number of eggs it was found to vary with the size ovaries .The number of eggs increased linearly with the increase of body length, body weight, gonadal length and gonadal weight. The mathematical relationship between the fecundity with other parameters such as total length, total weight, gonadal length and gonadal weight were calculated. The values of intercepts(a), regression co-efficient(b), co-efficient of correlation(r) were measured by least square method. It was found that all these relationships were positively correlated. It was observed that out of 2200 specimens, 937 specimens were males and 1263 specimens were females. Male to female ratio was 1:1.15. However the males were found to be dominant during the month of November and the females in the month of June. The females were predominant throughout the year. The Chi-square test shows that the male and female distribution in the natural population is significantly different at 5% level of probability.

Knowledge Management: Journal