Browsing by Author "Mohd. Azmi Ambak"

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    Can canola meal and soybean meal be used as major dietary protein sources for kuruma shrimp, Marsupenaeus japonicus?
    (Aquaculture, 2015-10-31) Mahbuba Bulbul; Md. Abdul Kader; Md. Asaduzzaman; Mohd. Azmi Ambak; Ahmed Jalal Khan Chowdhury; Md. Sakhawat Hossain; Manabu Ishikawa; Shunsuke Koshio
    A feeding trial was conducted to utilize canola meal and soybean meal as major dietary protein sources for kuruma shrimp, Marsupenaeus japonicus. Four isocaloric diets (19 kJ g−1) were formulated by reducing 0 (FM40), 70 (FM12), 85 (FM6) and 100% (FM0) of dietary fishmeal with a combination (4:6) of canola meal and soybean meal (blend). Based on a series of previous studies, all the plant protein diets (FM12, FM6 and FM0) were supplemented with 1.00% lysine, 0.50% methionine, 0.04% phytase and varying levels of fish soluble to improve the nutritional quality of the diets. Fifteen shrimp with an initial average weight of 1.74 g were randomly stocked in 12, 54 l rectangular tanks in triplicate per dietary treatments. The shrimpwere given the respective test diets daily by hand at 8–10% of bodyweight for 60 days. Final bodyweight (g) and specific growth rate (% day−1) were not significantly (P N 0.05) affected by reducing fishmeal with plant protein blend. Feed intake was also not varied among the dietary treatments. On the other hand, feed conversion ratio was significantly (P b 0.05) increased in the FM0 group, while no difference was found among the rests. Protein efficiency ratio had an opposite trend and the FM0 group demonstrated significantly lowest value. Similarly, protein gain (g kg weight gain−1) and protein retention (%) were significantly decreased in the FM0 group. Dietary treatments had no negative effects (P N 0.05) on the whole body composition. Significant effect was also not found on the protease activity (unit mg−1 protein) in the digestive tract of shrimp fed the FM40, FM12 and FM6 diets, while the value was significantly decreased in shrimp fed the FM0 diet. The values for the total hemocyte count (cellsml−1) and viable cells (%)were lowest in the FM0 group, however these parameterswere not significantly varied among the dietary treatments. Upon considering the results obtained in the present experimental condition, it has been concluded that canolameal and soybean meal could be effectively utilized as major protein sources by kuruma shrimp. The dietary fishmeal could be reduced to only 6% (85% replacement) with a blend of canola meal and soybean meal, and supplementation of methionine, lysine, phytase and fish soluble without compromising growth, feed utilization, body composition and health of juvenile kuruma shrimp. Statement of relevance: The research findings will help to develop plant protein based diets for crustaceans
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    Fish communities of Paya Bungor, with notes on its development, management and recreational use
    (Fakulti Pengajian Maritim dan Sains Marin, 1984-12) Mohd. Azmi Ambak
    Paya Bungor Lake is presently being developed into a recreational area by Pahang State Economic Planning Unit. As a contribution to provide a basis to ensure its sound development and management, an 18 month field study was conducted. This thesis presents (a) the general description of the limnological and other ecological properties of Paya Bungor, (b) the analysis of the fish populations including species composition, abundance, distribution patterns, community structure and the population dynamics of the major species, and (c) proposals for the management of Paya Bungor with emphasis on recreational fisheries.