Pusat Pengajian Sains Kajihayat - Tesis

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Growth And Biochemical Composition Of Isochrysis Maritima Billard And Gayral 1972 Under Photoautotrophic And Heterotrophic Conditions : Assessment For Aquaculture Feed
(2016-08)
Eshak, Mohammad Basri
The effects of photoautotrophic and heterotrophic conditions on growth and biochemical composition of isochrysis maritima, isolated from teluk aling, penang were investigated. Under photoautotrophic condition, i. Maritima was cultivated in different nitrogen sources (nitrate, nitrite, and urea) and harvested at different growth phases (exponential, early stationary and late stationary) to examine the impact of nitrogen sources and growth phases on growth and biochemical composition. The results revealed that urea at late stationary was the most suitable nitrogen source, which recorded high cell growth (10.9 ± 0.63 x 106 cell.Ml'1) and biochemical composition including protein (32.1 ± 3.17%), carbohydrate (37.0 ± 0.36%) and fatty acids content (total sfa = 32.92 ± 2.59 %; total mufa = 6.26 ± 0.83%; total pufa = 15.55 ± 1.49%) and was further investigated onto higher volume of walne’s medium (50 l). Under heterotrophic condition, i. Maritima was cultivated in different organic carbon sources (glucose, sucrose, lactose, fructose and sodium acetate) at different concentrations (0.02 m, 0.05 m and 1.0 m) with urea as nitrogen source to determine the suitable carbon sources and concentrations to maximize the growth of this strain.
The Effect Of Termite Baiting On The Ecology And Genetic Structure Of Coptotermes Gestroi Population
(2024-01)
M Vellupillai, Naveeta
Coptotermes gestroi is a prevalent subterranean termite pest known for significant ecological and economic consequences on infrastructure and cultivated crops worldwide. The efficacy of baits with chlorfluazuron, a type of Chitin Synthesis Inhibitor (CSI), as an active ingredient has been tested against the Coptotermes gestroi termites and progressive cessation of termite activity has been established. However, limited studies are available on baiting treatment effect on the genetic structure of subterranean termites. Therefore, this study investigated the breeding pattern and genetic structure of Coptotermes gestroi pre and post-baiting treatment with chlorfluazuron bait was investigated.
Length-Weight, Condition Factor And Feeding Guild Periophthalmus Chrysospilos (Bleeker, 1852) (Gobiidae: Oxudercinae), From Bayan Bay Coastal Water, Penang
(2016-08)
Abdullah, Mohd Ilman Che
A study on population dynamics and feeding biology of mudskipper, periophthalmus chrysospilos was conducted in bayan bay coastal water, penang from july 2013 to july 2014. This study comprised of three components: (i) length-weight relationships (lwr) and fulton condition factor (k); (ii) growth, mortality, and recruitment pattern, and (iii) stomach content analyses. The main objectives of this study are: (i) to investigate the length-weight relationships of p. Chrysospilos in different sexes and months, (ii) to elucidate the fulton condition factor and its relation to the monthly variations and water physio-chemical parameters, (iii) to study the growth parameters, mortality and recruitment pattern of p. Chrysospilos and finally (iv) to determine the feeding activities and feeding guild of p. Chrysospilos according to different sex, months and water tide. Results show the exponential values (zj) of the lwr for all individuals (n = 714), male and female fish, and fish caught during dry and rainy months were greater than 3, indicating of positive allometric growth. The fulton’s condition factor (k) for all individuals, male, female, and fish caught in dry and rainy months were 0.998 ± 0.121, 0.9907 ± 0.106, 1.008 ±0.138, 1.018 ± 0.115 and 0.998 ± 0.123, respectively. The b and k values for male and female fish were not significantly different. The b value in dry months is significantly higher than in rainy months.
Effect Of Varying Dietary Protein Levels In Snakehead Broodstock, Channa Striata (Bloch, 1793) On Egg, Larval Quality, Digestive Enzyme Activity And Ontogenic Development Of The Digestive Tract
(2016-01)
Manogoran, Janaranjani
The present study was carried out to determine the quality of eggs and larvae from channa striata broodstock that were fed different levels of dietary protein. C. Striata juveniles (mean weight 54.5 ± 2.6 g) were randomly selected and stocked in 4m x lm x im (length x width x depth) canvas tanks at adensity of 60 fishes per tank in triplicates for each treatment. Four experimental diets containing varying protein levels (350, 400, 450 and 500 g kg'1) were formulated and fed twice daily to satiation, at 10:00 a.M. And 17:00 p.M. For 6 months until spawning. After six months on the experimental diets, matured male and female brood fish were randomly selected for artificial spawning at the ratio of 1: 1. A series of two experiments were conducted to achieve the objectives of this cunent study. First, the quality of eggs and larvae were assessed based on biometric of egg and larvae, egg lysozyme, tolerance of larvae to starvation, tolerance to stress triggers such as temperature and ph and amino acid content.
Evaluation On Pathogenicity Of Entomopathogenic Fungi Metarhizium Anisopliae On The Rove Beetle, Paederus Fuscipes Curtis
(2018-12)
Tan, Andy Fu Hao
Rove beetle, Paederusjuscipes Curtis is a natural predator of several crop pests in agricultural ecosystem, however their high intrusion into human settlements causes them to become a public health concern due to Paedarus dermatitis infection among human. This study was undertaken to investigate the effectiveness of Metarhizium anisopliae fungi as a biocontrol agent for P. fuscipes, The pathogenicity of entomopathogenic fungi, Metarhizium anisopliae against the beetle P. fuscipes were tested using three teclmiques; soil infection, bait infection, and horizontal transmission via endo-cannibalistic behaviour.

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