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Sometrlc Studies on Certain Populations on Hilsa. Hilsa Iusha (hamilton), of the River Padma

Shamsud Doha
Department of Aquiculture and Management, Bangladesh Agricultural University, Mymensingh

Aminnl Hoque
Department of Aquiculture and Management, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Bitometric studies conducted on nine morphometrirc and four meristic characters of hilsa and jatka of the river Padma have shown that they belong to the same race and that the jatka are the juvenile hilsa .

Keywords: Biometric, Population on hilsa, Morphometric and meristic

Location: Department of Aquiculture and Management, Bangladesh Agricultural Uniuersity, Mymensingh.

Start Date: 00-03-1967

End Date: 00-07-1967

Program Area: Animal Health and Management

Commodity: Hilsa

Objectives:

To investigate and to find out, by analysing the populations of hilsa and jatka biometrically whether hilsa and jatka belonged to the same race and whether jatka was the juvenile hilsa or not.

Methodology:

Ninety four (94) jatka and 96 hilsa were collected from the river Padma near Goalundo in March and April and June and July, 1967, respectively with the help of local fishermen using gill nets. Upon collection, the fishes were washed and chilled in ice. Superficially, the jatka looked like an immature hilsa but the length of its head and body depth differed somewhat from those of hilsa. The maxillary extended to below middle of eye. The jatka had a rather dark back and silvery side shot with gold. Moreover, a row of spots was found along the upper third of the body. The hilsa was identified with the help of guideline given by Pillay and Rosa. he chilled jatka and hilsa were washed and cleaned with tap water and then soaked with a piece of blotting paper. Nine morphometric and four meristic characters of both jatka and hilsa were chosen for study. The morphometric characters were: 1) total length (TL), 2) fork length (FL), 3) standard length (SL), 4) body width (BW), 3) caudal peduncle width (CPW), 6) head length (HL). 7) snout length (SnL), 8) inter-orbital width (loW), and 9) eye diameter (ED). The meristic characters were: 1) lateral line scales (LLS); 2) abdominal scutes (AS); 3) dorsal fill rays (DFR) and 4) anal fin rays (AFR.). The selected morphometric characters of both hilsa and jatka were measured to the nearest mm from the left side of the fish. The BW and CPW were recorded with a vernier calliper. The HL, SnL, IoW, and ED were measured with a pair of dividers. Meristic counts for LLS, AS, DFR. and AFR were made with a pair of needles. In the DFR and AFR counts, the last ray was found to bear two ray elements that were separated at the very base of the fin. The last two bases were counted as one ray. All the morphometric and meristic data recorded from both hilsa and jatka were grouped into 5 mm classes with respect to TL and HL for statistical analyses, The regression equations for the relationships between FL and TL (FL- TL, i e., regression of FL on TL), SL.TL, BW-TL, CPW-TL, HL-TL, SnL-HL, IOW-HL, and ED-HL for both hilsa and jatka were computed using standard formulae. The correlation coefficients of all these relationships were determined and tested for significance. The analyses of covariance were made on the regressioos listed above, to determine any significant difference between hilsa and jatka. Tests were conducted on the mean values of the meristic charaters of the two samples for any significance.

Source of Information: Bangladesh J. Agril. Sci. 1 (2) : 129-134; 1974

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The results of the tests showed no significant difference between LLS-LLS, AS-AS, AFR-AFR and DFR-DFR of hilsa and jatka respectively at 5% level. These findings, therefore, further indicate that the hilsa and the jatka belong to the same race in the river Padma. It may thus be concluded that the jatka are the juvenile hilsa in the said river.

Knowledge Management: Journal