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Effect of water temperature on ovarian maturation stages of crenate<br />

swimming crab, Thalamita crenata.<br />

Mohd Lokman bin Halim<br />

Supervisor: Prof Dr Mhd. Ikhwanuddin Abdullah<br />

Bachelor of Science in Agrotechnology (Aquaculture)<br />

School of Fisheries and Aquaculture Sciences<br />

The study was aimed to characterize the ovarian maturation stages and to determine<br />

the effect of different water temperatures on ovarian maturation stages of Crenate<br />

swimming crab, Thalamita crenata. Three treatments were used; Treatment 1 (T1)<br />

(24°C), Treatment 2 (T2) (28°C) and Treatment 3 (T3) (32°C). Three samples from<br />

each treatment were chosen randomly every 15 days till Day 60 to determine the<br />

ovarian maturations through external morphological and histological examinations.<br />

Result showed that T2 were most succeeded in producing Stage 4 ovarian maturation.<br />

The highest mean Gonadal Somatic Index at Day 60 was T2 (3.19 ± 0.11) followed<br />

by T3 (2.94 ± 0.36) and finally T1 (1.92 ± 0.58). Mean oocyte diameters for T2 also<br />

the highest at Day 60 (136.20 ± 11.85) followed by T3 (120.02 ± 15.51) and lastly<br />

T1 (119.86 ± 15.33). Thus, the most suitable water temperature to stimulate ovarian<br />

maturations of T. crenata was at 28°C.<br />

495 | UMT UNDERGRADUATE RESEARCH DAY 2018

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