M. A. Alam
Assistant Professor
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh
Growth, Meristic, Morphometric, P. hypophthalmus, P. pangasius, Taxonomic and variation.
Animal Health and Management
Sample collection
Fingerlings of the local pangas were collected from Bangladesh Fisheries Research Institute (BFRI), Riverine Station, Chandpur and Thai pangas were collected from Al-Amin hatchery, Mymensingh on 16th July 2011.
Rearing of fingerling
The fingerlings were reared in the ‘Field Laboratory Complex’, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. Three ponds were used for each source to observe the growth performance of two species. A commercial fish feed (Mega feed) was supplied two times in a day. Sampling was done on every fifteen days interval at morning. The length and weight were recorded by random sampling of 20 fingerlings from each pond by using a measuring scale and digital balance. After the collection of samples from both sources, 30 individuals were used for taxonomic study.
Study of Growth parameters
The following parameters were studied to evaluate the growth performance:
Length gain (cm) = Average final length – average initial length
Weight gain (g) = Average final weight – average initial weight
Percent gain in length = ×100
Percent gain in weight = ×100
The specific growth rate (SGR) is the instantaneous change in weight of fish calculated as the % increase in body weight per day over a given time interval
Specific Growth Rate (SGR) = {(LnW2-LnW1) / (T2-T1)} ×100
Where,
W2 = Final live body weight (g) at time T2
W1 = Initial live body weight (g) at time T1
Morphometric characteristics
The following sixteen morphometric characteristics were measured by using the method described by Hubbs and Lagler (1958): Total Length (TL); Fork length (FL); Standard length (SL); Head length (HL); Pre-orbital length (PrOL); Post-orbital length (PsOL); Eye length (EL); Highest body depth (HBD); Least body depth (LBD); Pre-dorsal length (PrDL); Post-dorsal length (PsDL); Caudal fin length (CFL); Anal fin length (AFL); Mouth gape (MG); Barbel length (BL) to the nearest 0.1 cm using a slide calipers.
J. Patuakhali Sci. and Tech. Univ. 2013, 4(2):1-12
Journal