Fakulti Sains dan Teknologi

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The Echo Sounder simulator unit based on microcomputer systems
(University of Hull, 1981-09) Mohamad Isa Mansor
The aim of the project is to study the possibility of using a microcomputer system to implement an echo sounder simulation. The design flexibility of the microprocessor software enables the development of a simulation program necessary to produce an echo signal suitable for a conventional echo sounder. An optional colour display is provided to give a simultaneous recording of the targets. The colour display is generated on a colour t.v. with a colour display generator capable of providing up to seven colours to represent the varying echo intensity. Also a demonstration of mid-water trawling manoeuvre is provided on the colour display.
Heavy metal toxicity to rainbow trout, Salmo Gairdneri Richardson, during early development
(Fakulti Sains dan Teknologi, 1983) Noor Azhar, Mohamed Shazili
The toxicity of cadmium, copper and zinc to rainbow trout, Salmo gairdneri Richardson, during early development was investigated. In addition the synthesis of cadmium-binding protein by the perfused rainbow trout liver was studied. It was concluded that; 1) Cadmium is extremely toxic to rainbow trout during early development. A continuous cadmium exposure during embryonic development resulted in almost complete mortality of eggs at 1.0 mgCdl *. Some sublethal effects were also observed in hatched alevins. 2) Embryonic sensitivity was not uniform throughout egg development. The fertilisation process was particularly sensitive to cadmium viexe, exposure. Reductions in the fertilisation of eggs was obtained as a result of exposure to 1.0 mgCdl * and higher. The results also indicated that the period of axiation was sensitive to cadmium exposure as shown by a high mortality rate of eggs in continuous exposure tests. 3) Embryonic sensitivity to cadmium and zinc differed from sensitivity to copper indicating possible differences in toxic actions between these metals. 4) The toxicity of mixtures of cadmium, copper and zinc indicated that the toxicity of these metals to trout eggs and fry could be assessed by the additive toxic unit method to give the total toxicity of the mixture. However sublethal effects and metal uptake studies showed possible departures from additive joint action. 5) Post exposure mortalities may result from brief exposure of fish to cadmium even after restoration to clean water. These results highlight the inadequacy of a standard toxicity test in predicting the consequences of brief exposure to a pollutant.
The development of a telemetry and position indicating system for a diver
(Fakulti Sains dan Teknologi, 1994) Samo, Khalid
In a diving expedition safety is important both to the personnel on board the support boat and the divers. A diver needs to know their bearing and range to the support boat as diving progress to navigate freely in the water and to return to the boat immediately in time of emergency or after completing a task. Ideally, this may be achieved by computing the diver's bearing and range periodically using an underwater tracking system fitted on a support boat and transmitting the information back to them by acoustic means. However, despite the availability of electronic based diver tracking systems, no attempt was made to exploit this idea. The reason being the extensive and rapidly time-variant multipath echoes generated in a shallow water made it difficult to process the coded information if transmitted at high rates due to signal masking. Also, air bubble noise generated through breathing, physical movement and biological noise from snapping shrimps hinders effective propagation and reception of the data signals in the water.
Studies on some aspects of reproduction of mud crab, scylla serrata (forskal)
(Fakulti Sains dan Teknologi, 1997) Tran, Ngoc Hai
Some aspects on reproduction of mud crab, Scylla serrata, in captive conditions were studied. By ablation of bilateral eyestalks of the female, 14 batches of eggs were spawned after 5 days of culture in fiberglass tanks. Spawning occurred at any time of day, month and year. Majority of crabs spawned without undergoing molting and mating under culture condition. Crab spawners were mainly in size of 201-300 g. Average fecundity was 1479992.12 ± 17.03 eggs / crab. However, many eggs could not adhere to the pleopods of the female but fell on the bottom of the tanks. Regression between body weight of female and fecundity was significant (p<0.05). In addition, the second spawning of the crabs under captivity was also observed.
Fisheries and population dynamics of scads, decapterus spp. (pisces: carangidae), in the east coast of peninsular Malaysia
(Fakulti Sains Gunaan dan Teknologi, 1997-09) Wijopriono
Kajian ke atas beberapa aspek perikanan dan dinamik populasi ikan selayang, iaitu Decaptents macrosoma (Bleeker) dan Decapterus russelli (Ruppell), telah dijalankan di Pantai Timur Semenanjung Malaysia. Penyampelan bulanan di pusat pendaratan ikan utama di Terengganu dijalankan selama 12 bulan. Sampel diambil dari tempat pendaratan dan di atas kapal pukat jerut komersial yang beroperasi di zon perikanan B dan C. Data sekunder juga direkod daripada LKIM (Lembaga kemajuan Ikan Malaysia) Terengganu
Temperature profiling and sex ratios of green turtle hatchlings (Chelonia Mydas) of Chagar Hutang beach in Pulau Bidong, Terengganu, Malaysia
(Fakulti Sains dan Teknologi, 1997-11) Pushpalatha M. Palaniappan
A study of sand temperatures and an analysis of sex ratios were conducted in Chagar Hutang in 1995 to determine the temperature regime of the beach and the sex ratio of the green turtle hatchlings that would have been produced from nests deposited in this beach. The beach was divided into two thermal zones, the'Shade* zone which was located 2 metres from vegetation and the 'Open beach' zone which was located between the 'Shade' zone and the high tide mark. Average temperatures of the whole study period in the open zone which were higher exceeded those in the shaded zone by not more than 1.39°C.
Studies on some aspects of reproduction of mud crab, scylla serrata (forskal)
(Fakulti Sains dan Teknologi, 1997-12) Tran, Ngoc Hai
Some aspects on reproduction of mud crab, Scylla serrala, in captive conditions were studied. By ablation of bilateral eyestalks of the female, 14 batches of eggs were spawned after 5 days of culture in fiberglass tanks. Spawning occurred at any time of day, month and year. Majority of crabs spawned without undergoing molting and mating under culture condition. Crab spawners were mainly in size of 201-300 g. Average fecundity was 1479992.12 ± 17.03 eggs / crab. However, many eggs could not adhere to the pleopods of the female but fell on the bottom of the tanks. Regression between body weight of female and fecundity was significant (p<0.05). In addition, the second spawning of the crabs under captivity was also observed.
Non-cooperative game theory as a decision-making tool in conflict situations and asymmetric information
(Fakulti Sains dan Teknologi, 1998) Mohamed, Osman Abdel Ghani
The main purpose of this research is to study non-cooperative game theory as strategic decision making tool in conflict situations, with describing how to find solution to these models and to analyze asymmetric information.The objective of dealing with the problem of decision making in conflict situations is to find optimal strategy among alternative strategies. Two approaches will be put into consideration; The mathematical modeling of the situation and computational solutions for these models.
Ikan Chaetodontid sebagai ikan penunjuk kepelbagaian terumbu karang perairan Pulau Bidong Terengganu, Malaysia
(Fakulti Sains dan Teknologi, 1998-04) Damanhuri, Harfiandri
A study of Chaetodontid fishes as an indicator for the condition of corals was conducted around Pulau Bidong Terengganu for eight months. Observations were done at four station using 50 m transect line. Data collection for the corals and fishes was based on benthic lifeform category and fish visual census method respectively.
Target strength and school size assessment of scads using hydroacoustic
(Fakulti Sains dan Teknologi, 1998-11) Hermawan, Maman
The study has been conducted with two phases. The first phase involving laboratory experiment on fish target strength measurements of three commercially important pelagic fish species of the scads namely Round scad {Decapterus maruadsi), Ox-eye scad (Selar boops) and Yellow-banded scad {selaroides leptolepis). The second phase include both in situ side aspect target strength and fish schools estimation attracted around fish aggregating light. Fish physical characteristics such as total length, fork length, standard length, and weight were recorded in order to study relationship of TS to fish size. The samples sizes of Round scad, Ox-eye scad and Yellow-banded scad ranged from 11.40 to 20.50 cm, 10.0 to 20.7 cm and 7.0 to 15.6 cm (standard length), respectively.
Kajian triploid ikan baung Mystus Nemurus'(C.&V.)
(Fakulti Sains dan Teknologi, 1998-12) Abdul Rahman, Haji Ismail
Kajian pengaruhan triploid menggunakan rawatan renjatan suhu sejuk dan panas terhadap ikan baung, Mystus nemurus telah dilakukan. Bagi menentukan kejayaan triploid, kajian tumbesaran dan perkembangan gonad ikan triploid juga dijalankan.
The effects of controlled environment and diets on broodstock maturation, spawning, spermatophore quality and juvenile production of penaeus merguiensis (de Man)
(Fakulti Sains dan Teknologi, 1999) Olubunmi, Akinfolajimi
Some aspects of the maturation and artificial propagation of Penaeus merguiensis were studied. The percentage of naturally matured shrimps that were transported to the hatchery and spawned was 83.33% while the percentage of hatchery matured shrimps that spawned were 66.66%, 50.00%, 50.00% and 33.33% for broodstocks fed with squids (Loligo sp.), polychaete (Diopatra sp.), Artemia biomass and pellets diets, respectively.
Hydroacoustic assessment of pelagic fish around Bidong Island, Terengganu, Malaysia
(Fakulti Sains dan Teknologi, 1999-02) Hassan, Musse Gabobe
The first phase of this study investigates the average dorsal aspect (side) target strength of three commercially important fish species, namely Rastrelliger kanagurta, Atule mate and Thunnus tonggol, which are mostly captured by commercial fishermen in waters around Bidong Island. Target strength experiments were carried out in a controlled tank at Universiti Putra Malaysia Tcrengganu by using a digital transducer split beam echo sounder at 200 kHz. Fish size for this experiment varied from 13.6 to 24.5 cm total length (avg. 18.8 cm) for Rastrelliger kanagurta, 13.8 to 27.5 cm (avg. 20.0 cm) for Atule mate and 28.5 to 52.0 cm (avg. 39.6 cm) for Thunnus tonggol. Significant differences (a = 0.05) were observed between fish total length and weight of all species tested.
Feeding biology in early life stages of green catfish, Mystus Nemurus (CUV. & VAL)
(Fakulti Sains dan Teknologi, 1999-05) Thumronk, Amornsakun
Studies were undertaken on some aspects of the feeding biology in the early life stages of the green catfish, Mystus nemurus (Cuv. & Val.) in order to get some information fundamental to the developed and improvement of fry production in the hatchery.
Distribution and ecology of the Malaysian Mahseer (Genus: Tor) in Kenyir Lake, Malaysia
(Fakulti Sains dan Teknologi, 1999-10) Sopha, Lieng
A study on distribution and ecology of the Malaysian mahseer (Tor soro Cuvier & Valenciennes and Tor tambroid.es Bleeker) was carried out in lotic and lentic habitats in Lake Kenyir, Malaysia.
Effects of phenanthrene on isochrysis galbana
(Fakulti Sains dan Teknologi, 1999-12) Hing, Lee Siang
The effects of phenanthrene on Isochrysis galbana were carried out using batch culture and continuous culture techniques. The growth tests were conducted in enriched sea water at 28.0 ± 1.0 °C, pH of 8.1 ± 0.5, salinity 30 ± 2 ppt and under continuous light illumination of 45jLimol quanta/m2/s. For batch culture, growth was estimated by increase in cell number with time. Extent of growth inhibition was influenced by concentration of phenanthrene and duration of exposure. Phenanthrene concentration of 5 mg/1 and 7 mg/1 temporarily inhibited the growth of cells and lethal effect was observed for concentrations higher than 7 mg/1. The IC50 value (the concentration of phenanthrene that causes 50% inhibition in growth of Isochrysis galbana relative to control) determined by batch culture technique was 3.58 mg/1.
Hydrodynamic resistance of trawl net in the east coast of peninsular Malaysia
(Fakulti Sains dan Teknologi, 2000-04) Hasansukri, Mamat
A study on hydrodynamic resistance of trawl nets in the East Coast of Peninsular Malaysia was carried out with three objectives: determining the length of structural characteristics of trawl net in relation to the net resistance, formulating a general net resistance equation and determining the resistance in each section of trawl net components which is currently employed by Malaysian fishermen.
Fishery and population dynamics of the pink prawn, Metapenaeus Intermedius in east Johor waters, peninsular Malaysia
(Fakulti Sains dan Teknologi, 2000-04) Ibrahim Johari
The aim of this study is to investigate the fishery and population dynamics of the pink prawn, Metapenaeus Intermedius in east Johor waters, peninsular Malaysia
Kesan pemberian makanan yang diperkayakan dengan vitamin dan spirulina terhadap tumbesaran dan perkembangan Gonad ikan kelah, Tor Tambroides (Bleeker)
(Fakulti Sains dan Teknologi, 2000-05) Rozihan, Mohamed
Maklumat mengenai pemakanan dan kesannya ke atas perkembangan gonad adalah penting di dalam pengurusan induk. Untuk tujuan ini satu kajian telah dijalankan ke atas ikan kelah, Tor tambroides, satu spesies ikan rekreasi yang terancam, sebagai pemangkin kepada program pelepasan semula (restocking programme). Kajian mengenai kesan pemberian diet protein yang berbeza dan diet diperkayakan dengan vitamin dan Spirulina ke atas tumbesaran dan perkembangan gonad melalui pemerhatian histologi telah dijalankan di makmal UPMT.
Studies on nutrition and development of digestive function in tropical sport fish Tor Tambroides (Bleeker) fry
(Fakulti Sains dan Teknologi, 2000-05) Chowdhury, Ahmed Jalal Khan
Malaysian mahseer Tor tambroidesA locally known as "Kelah" is a well known sport fish in Malaysia and recent catch statistics indicated that this highly valued species have declined and can be considered as endangered. In order to facilitate restocking programme, a study on nutrition was conducted at UPM, Terengganu. E i A t experiments were carried out to determine the feeding frequency, stocking density, optimal protein level and additives, digestibihty, development of enzymes, carotenoids and replacement of live foods of T. tambroides fry (mean SL 6.0 mm-lO.O mm and weiAiing 0.06-0.08 g).

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