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Morphological Variability of the 11th Generation Strain of Nile Tilapia, (oreochromis Niloticus) and Traditional Genetically Improved Farmed Tilapia

K. M. Shahriar Nazrul
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

U. S. Tonny
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

B. S. Sarker
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3202,Bangladesh

A. A. Mamun
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3202,Bangladesh

Abstract/ Executive Summary:

To investigate the morphological variations 12 morphometric and 11 meristic characters were studied for 100 individuals of the same age of traditional strain GIFT (5^th generation) and recently developed 11^th generation strain (GIFU) of Nile tilapia, Oreochromis niloticus. No significant difference was found between total length and other body measurements at 5% level. However, GIFU showed faster linear growth on body depth, maximum body circumference and minimum body circumference where GIFT showed faster linear growth on standard length and head length. On meristic characters, notable variations were observed in case of scale above and below the lateral line, where GIFU individuals showed greater number of scales in both cases. The total length and body weight relationship of both the strains were found to be straight line in logarithmic scales. The mean values of condition factor (K) have been found to be 1.671 for GIFT and 1.711 for GIFU and the mean values of relative condition factor (Kn) were 1.001 and 1.002 for GIFT and GIFU respectively. Findings of the present study suggested the variability of strain GIFU and GIFT in some important parameters.

Keywords: Morphometric, Meristic, GIFT, GIFU, Oreochromis niloticus

Location: Bangladesh Agricultural University

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Tilapia

Objectives:

1. To identify the morphometric and meristic variations between the 5th generation GIFT and 11th generation GIFU strain of nile tilapia, (Oreochromis niloticus).

Methodology:

100 individuals of each strain of the same age and total length ranging from 115 mm to 257 mm were collected from earthen ponds of Zubin Agrobased Industries Limited, Noakhali. Total length (TL), standard length (SL), head length (HL), pre-orbital length (PreOL), eye diameter (ED), post-orbital length (PostOL), inter-orbital length (IOL), snout length (SnL), mouth gape (MG), maximum body circumference (MaxBC), minimum body circumference (MinBC) and body depth (BD) of fish were measured to the nearest mm using fish measuring board. The fishes were weighed on tanetag, KD-160 balance having one gm precision. Meristic characters which were studied are dorsal fin spines (DFS), dorsal fin soft rays (DFSR), pectoral fin soft rays (PecFSR), pelvic fin spines (PelFS), pelvic fin soft rays (PelFSR), anal fin spines (AFS), anal fin soft rays (AFSR), caudal fin rays (CFR), branchiostegal rays (BrgR), scale above lateral line (SALL) and scale below lateral line (SBLL). The body characters viz. SL, HL, PreOL, ED, PostOL, IOL, SnL, MG, Max BC, Min BC, BD were expressed as percent to total length of the fish as done. Regression of various body parts against TL of fish were drawn by least square method.

Source of Information: J. Bangladesh Agril. Univ. 9(2): 345–349, 2011

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Strain GIFU showed faster linear growth on maximum and minimum body circumference along with body depth whereas strain GIFT showed faster linear growth on standard length and head length. Notable variations were found in case of scales above and below the lateral line. Condition factor and relative condition factor were found higher in GIFU during the study period. For further study, genetic level works like allozyme electrophoresis, DNA based markers i.e. microsatellite, PCR- RFLP, RAPD etc. should be conducted to identify the actual reason of such variations.

Knowledge Management: Journal