Population dynamics of the cyprinid fish, Amblypharyngodon mola (Hamilton) from the Kaptai lake, Bangladesh

Abstract

Length frequency based population dynamics of the small indigenous cyprinid fish, Amblypharyngodon mola from the Kaptai lake (an artificial water reservoir), Bangladesh were studied using the computer based FiSAT program. Growth parameters La and K were found to be 104.65 mm and 0.95 year-1 respectively. The annual rate of natural mortality (M), fishing mortality (F) and total mortality (Z) were found to be 1.22, 2.04 and 3.26 respectively. Exploitation rate (E) was 0.63, while maximum yield per-recruit (Emax) was estimated as 0.678. The suitable selection pattern (L50) was found to be 51.09 mm. The yield per recruit and biomass per recruit determined as a function of Lc/La and M/K were estimated as 0.49 and 1.28 respectively. The Wetherall plot provided estimates of La and Z/K were 103.38 mm and 3.31 respectively. Growth performance index (?? = 4.017) was found to be suitable. Virtual population analysis (VPA) showed that the maximum number of A. mola was caught between the total length of 75 to 93 mm with values of F exceeding to 2.04 year-1. The estimated mean biomass was found to be 2.81 metric tons. The fish was recruited in the fishery during March to October with maximum in July. DOI: http://dx.doi.org/10.3329/cujbs.v4i1.13398 The Chittagong Univ. J. B. Sci.,Vol. 4(1&2):141-151, 2009

Morphological relationships, growth patterns and some aspects of reproductive biology of Sind Danio Devario devario (Hamilton 1822)

“…According to the Powell-Wetherall plot, L ∞ values were noted as 7.47 to 7.52, 7.13 to 7.15 and 7.38 to 7.47 cm, while Z/K values varied from 0.812 to 1.125, 0.934 to 1.09 and 0.979 to 1.295 for the female, male and com-bined sexes of D. devario respectively (Figure 2). Azadi and Mamun (2009) observed that values of L ∞ and Z/K recorded as 10.338 and 3.310 cm for A. mola were relatively higher than the present fish species for their taxonomic variations.…”

“…Zakeyuddin et al (2017) found that L ∞ values were 10.90 cm, which is comparatively higher than the present value, which might be due to the geographical variation, whereas the Ø value was 2.15 for D. regina from the Sungai Kerian Basin in Malaysia, which is close to the present findings. Azadi and Mamun (2009) also estimated the asymptotic length (L ∞ ) for Amblypharyngodon mola as 10.465 cm and the Ø as 4.017, which were higher than D. devario and may be due to different taxa. The growth coefficient (K) of D. devario varied from 0.78 to 1.8 year -1…”

Clupeids in the kaptai reservoir, a blessing or a curse: estimation of fisheries reference points

“…There have been some works focusing on the limnological and biological aspects of the reservoir [ 20 , 21 ], biodiversity conservation [ 22 , 23 ]. Some studies have also been done on population dynamics[ 19 , 24 , 25 , 26 ]; and ecosystem functions [ 27 , 28 ]. Yet, no work has been done to estimate the biological reference points (BRPs) of these two fish stocks from the Kaptai reservoir.…”

Population dynamics of the mullet fish, Rhinomugil corsula (Hamilton, 1822), in the Sitakunda coast of the Bay of Bengal

“…In Bangladesh population dynamics of several fishes have been done by many authors such as Mustafa and Khan (1988), Azadi et al ( , 1996Azadi et al ( , 1997, Azadi and Quddus (1995), Azadi and Barua (1999), Mustafa and Azadi (1995), Azadi (2000), Azadi andMamun (2009), andSarkar et al (2017). However, studies on population dynamics of mullets, especially of Rhinomugil corsula, has not been done yet in Bangladesh.…”