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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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        Abstract - Issue Sep 2018, 39 (5)                                                                                                             Back

nstantaneous and historical temperature effects on a-pinene

Mouth morphological development of Hilsa (Tenualosa ilisha)

larvae collected from Meghna Estuary, Bangladesh


Md. G.S. Riar1, R. Ara1, S.M.N. Amin1, Mohd. S. Kamarudin1, Md. A. Wahab2, Nur- A- Raushon3, J. Arockiaraj4 and A. Arshad1*

1Laboratory of Fisheries Biology and Aquatic Ecology, Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia,

43400 UPM, Serdang, Selangor, Malaysia

2ECOFISH-BD, WorldFish, South Asia, Bangladesh, Banani, Dhaka 1213, Bangladesh

3Bangladesh Fisheries Research Institute, Mymensingh, 2201, Bangladesh

4Faculty of Science and Humanities, SRM University, Kattankulathur - 603 203, India

*Corresponding Author E-mail:




Key words

Early juvenile

Flexion stage

Jaw length

Mouth gape

Tenualosa ilisha




Publication Data

Paper received : 10.06.2017

Revised received : 21.10.2017

Re-revised received : 15.11.2017

Accepted : 28.12.2017



Aim: In larval fish, food size is closely related with the length of the fish jaw, as well as mouth gape. So far, no information is available on the larval mouth morphology of Hilsa shad Tenualosa ilisha. Hence, observations on the mouth morphological development during different larval stages of T. ilisha were examined.     


Methodology: Samples of T. ilisha larvae were collected weekly from Meghna estuary, Bangladesh between August 2016 and January 2017. The collected samples were transported to the laboratory and the mouth morphology of larvae and early juvenile stages were microscopically examined.      


Results: The smallest mouth size was found at 450, while was largest found was at 900. There was no evidence of teeth, while the lower jaw was longer than the upper jaw. The four larval stages were observed in this study; viz. yolk-sack stage, pre-flexion stage, flexion stage, post-flexion stage. The mouth was closed at yolk sac stage while in the pre-flexion stage, larval mouth gape ranged between 177 and 367 μm. In the flexion stage, the range was 241 to 497 μm, in post-flexion stage it ranged between 307 and 621 μm and finally in early juvenile stage the range was 393 to 788 μm.


Interpretation: There was a significant relationship with standard length (SL) and upper jaw length (R2 = 0.941, p < 0.05) as well as lower jaw (R2 = 0.931, p< 0.05). Significant relationship was also found with SL and mouth gap at 900 (R2 = 0.938, p < 0.05). Overall, these findings can be considered a base data for mouth morphological development of T. ilisha.




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