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Biometric Indices and Size at First Sexual Maturity of Eight Alien Fish Species from Bangladesh

Md. Yeamin Hossain
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Md. Alomgir Hossen
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Md. Mahmudul Islam
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi, Bangladesh

Md. Nasir Uddin Pramanik
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Fairuz Nawer
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

Alok Kumar Paul
Department of Fisheries, Faculty of Agriculture, University of Rajshahi, Rajshahi, Bangladesh

H.M. Adnan Hameed
Centre of Agricultural Biochemistry and Biotechnology, University of Agriculture, Faisalabad, Pakistan

Md. Mosaddequr Rahman
Faculty of Fisheries, Kagoshima University, Kagoshima, Japan

Gitartha Kaushik
Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India

Sabitry Bardoloi
Resource Management and Environment Section, Life Sciences Division, Institute of Advanced Study in Science and Technology, Guwahati, Assam, India

Abstract/ Executive Summary:

The biometric indices and size at first sexual maturity of eight alien fish species from several water bodies in Bangladesh were studied for the first time. A total of 273 individuals of eight alien fish species (Barbonymus gonionotus, Clarias gariepinus, Ctenopharyngodon idella, Cyprinus carpio, Hypophthalmichthys molitrix, H. nobilis, Oreochromis niloticusandPangasianodon hypophthalmus) were collected using traditional fishing gears from June 2014 to May 2015. Among the four condition factors (Allometric condition factor, Fulton’s condition factor, Relative condition factor, and Relative weight) studied, Fulton’s condition factor was the best for assessing the well-being of these alien species in their natural habitat, based on the relationships of condition factors with body weight andtotal length. The calculated form factor was 0.0270 forB. gonionotus, 0.0077 for C. gariepinus, 0.0119 for C. idella, 0.0194 for C. carpio, 0.0101 forH. molitrix, 0.0092 for H. nobilis, 0.0158 for O. niloticusand 0.0105 for P. hypophthalmus. The size at first sexual maturity was estimated in TL as 12.30 cm forB. gonionotus, 25.53 cm for C. gariepinus, 32.80 cm for C. idella, 18.22 cm for C. carpio, 23.92 cm for H. molitrix, 30.18 cm for H. nobilis, 21.78 cm for O. niloticus, and 21.32 cm for P. hypophthalmus. The present study also calculates the form factor and first sexual maturity of these alien species from different water-bodies the world over. The findings of this study can be very helpful for the sustainable management of these alien species in Bangladesh and similar ecosystems.

Keywords: Biometric index; Condition- and form- factor; Sexual maturity; Alien species; Bangladesh

Location: North and north-western parts of Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Fish

Objectives:

Our study presents the information on biometric indices including condition- and form-factors, and size at first sexual maturity of 8 alien fish species from Bangladesh for the first time.

Methodology:

The present study was carried out in the north and north-western parts of Bangladesh. Fishes were collected from different water bodies including beels (a wetland with stagnant water) (Beelkumari, Rajshahi, Lat. 24°600N, Long. 88°590E; Chalanbeel, Natore, 24°380N, 89°440E), floodplains (Tista floodplain, Kaunia, Rangpur, 25°770N, 89°390E; Padma flood-plain, Godagari, Rajshahi, 24°470N, 88°440E), and rivers (Tista River, Rangpur, 25°820N, 89°410E; Karatoya River, Bogra,24°850N, 89°380E; Padma River, Rajshahi, 24°220N; 88°350E) by various types of traditional fishing gears including castnet, gillnet, and square lift net during June 2014 to May 2015. Total length (TL) and body weight (BW) of each specimen were measured to 0.1 cm and 0.1 g accuracy with digital slide calipers and electronic balance, respectively. The allometric condition factor (KA) was estimated using the formula of Tesch (1968):KA=BW/TLb, where BW is the total body weight; TLis the total length, and is the parameter of length-weight relationships (LWRs) (Hossain et al., in review). The Fulton0s condition factor (KF) was estimated using the equation:KF= 100(BW/TL3), where BW is the total body weight; and TLis the total length. The scaling factor of 100 was used to bring the KF close to unit. The relative condition factor (KR) was assessed by the equation ofLeCren (1951):KR=BW/(aTLb), where BW is the total body weight; TLis the total length; and a and b are LWRs’ parameter (Hossain et al., in review). The relative weight (WR) was estimated following Froese (2006) as: WR=(W/WS)100, where Wis the weight of a particular individual and WSis the predicted standard weight for this individual and was calculated asWS=aTLb, where a and b values were obtained from TL and BW relationships(Hossain et al., in review). The form factor (a3.0) for these alien species was calculated using the equation of Froese (2006)as:a3.0=10log as(b3), where and are LWRs parameter and sis the regression slope of n a vs. b(Hossain et al., in review). The size at first sexual maturity (Lm) was calculated by the equation of Binohlan and Froese (2009) as: log (Lm)=0.1189 + 0.9157 * log (Lmax) for the different ecosystem separately. Furthermore, our study calculated the form factor and first sexual maturity of these alien fish species from different worldwide water bodies using data from the available literature. Statistical analyses were done using MicrosoftÒExcel-add-in-DDXL and Graph Pad Prism 6.5 software (GraphPad Software, Inc., San Diego, CA). Spearman rank correlation test were used to compare the relationships of condition factors with TL and BW. All statistical analyses were significant at5% (P< 0.05).

Source of Information: Egyptian Journal of Aquatic Research (2016) 42, 331–33

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Condition factors are very important for assessing the condi-tion of fish species in different habitats (Froese, 2006; Hossain et al., 2012a). In our study, we have worked on four condition factors (KA, KF, KR, and WR), based on their relationships with TL and BW, Fult on 0s condition factor was the best index for assessing the well-being of these alien species in our study areas. The form factor is a marker of body shape; elongated, round, or spherical (Froese, 2006). According to Froese (2006), B. gonionotus, C. carpio, and O. niloticus was short and deep bodied (form factor ranges from 0.0158 to0.0270).C. idella, H. molitrix,H. nobilis, andP. hypothalamus were fusiform (form factor varied from 0.0092 to 0.0119), and C. gariepinus was elongated (form factor 0.0077) in shape. The size of fishes may vary due to gender, season, feeding rate, gonadal development, water flow, and their behavior(Tarkan et al., 2006; Hossain et al., 2006; Muchlisin et al.,2010), which we did not study. Studies on size at sexual maturity of fishes from Bangladeshi waters are limited (exceptHossain et al., 2010, 2012b, 2012c). This is the first attempt to estimate the size at fist sexual maturity of these alien species from Bangladeshi waters and elsewhere, using available literature. The size at sexual maturity varies from one habitat to another, likely due to the diverse climatic and trophic parameters that characterize various areas (Sinovcic and Zorica,2006). However, there are no references dealing with the condition, form factor, and size at first sexual maturity of these alien species which prevents the comparative study. Therefore, the findings of this study provide an important baseline for further study and comparisons

Knowledge Management: Journal