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Length-length and Length-weight Relationships and Condition Factor of Nine Freshwater Fish Species of Nageshwari, Bangladesh

Most Habiba Ferdaushy
Department of fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh.

Mohammad Manjurul Alam*
Department of fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh.

Abstract/ Executive Summary:

The research carried out the length-length relationships (LLR), length-weight relationship (LWR) and condition factor of nine freshwater small indigenous species viz. G. giuris, E. Danricus, M. pancalus, L. guntea, C. fasciatus, P. sophore, H. Fossilis, C. punctatus and M. cavasius from the water bodies of Nageshwari, Bangladesh. Relationships among different body length parameters of each species were found highly significant with all “r” values being >0.900. LWRs were obtained on the form of TW = TLb . The “b” values range from 2.65-3.03. The parameter “b” of the length-weight relationship equation showed higher value (>3) only for G. giuris and C. fasciatus. Rest of the specimens showed lower value (<3) but close to the value of 3 and relationships were found highly significant with all “r” values being >9.00. The Fulton’s condition factors showed positive growth tendency for five specimens viz. G. giuris, C. fasciatus, P. sophore, C. punctatus, M. cavasius; and negative tendency for four specimens viz. E. danricus, M. pancalus, L. guntea, and H. Fossilis.

Keywords: Length-weight, Condition factor, Morphometrics, Indigenous species

Location: Nageshwari (25.9792°N 89.7083°E), Bangladesh

Start Date: 00-10-2011

End Date: 00-01-2012

Program Area: Conservation and Biodiversity

Commodity: Fish

Objectives:

The present study aimed to find out the present status of length-length and length-weight relationship; and condition factor of nine fish species viz. Glossogobius giuris, Esomus danricus, Mastacembelus pancalus, Lepidocephalus guntea, Colisa faciatus, Puntius sophore, Heteropneustes fossilis, Channa punctatus, and Mystus cavasius. Findings of the work will play an important role for the successful management of these species to conserve from probable depletion of their wild stock in the future.

Methodology:

The specimens were collected fortnightly from the fishers of Nageshwari (25.9792°N 89.7083°E) water bodies during day time from October, 2011 to January, 2012. During the period a total of 540 specimens (each of 60) were collected and confirmed to the species level and preserved by date in plastic jars with 5% formalin. For each individual different body lengths TL, PL, PVL, SL, HL, DL, AL were measured with the help of a digital slide caliper and whole body weight (TW) was taken with the help of a digital balance Model: KD-300KC with 0.01 g accuracy (Simon and Mazlan, 2008; Alam et al., 2012). The values of the constant “a” and “b” of the linear regression was determined by following Rounsefell and Everhart (1953) and Lagler (1966). The Fulton’s condition factor, K was calculated by using the following formula: K = (TW/TL3 ) × 100. Where, K = Fulton’s condition factor, TW = Total body weight, TL = Total body length. Here, factor 100 is used to bring K close unity. All the data were analyzed by using computer software SPSS version 15.0.

Source of Information: International Journal of Aquatic Biology (2015) 3(3): 149-154 ISSN: 2322-5270; P-ISSN: 2383-0956

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The outcome of the present study has provided some new and updated information on the morphometric characters of nine freshwater fish species of Nageshwari, Bangladesh. Though the fishes are small, they have very good consumer demand with relatively high nutritional value. Findings of the present investigation may play an important role in country economy being key factors for the management and conservation of these species as well as other fish species of Bangladesh.

Knowledge Management: Journal