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Chicken Eggshell as an Innovative Bioflocculant in Harvesting Biofloc for Aquaculture Wastewater Treatment

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Journal of Renewable Materials 2023年第5期11卷 2321-2332页

作者： Hajjar Hartini Wan Jusoh nor azm.n kasan Hidayah Manan nurfarahana Mohd nasir Fareza Hanis Mohd Yunos Sofiah Hamzah Ahmad Jusoh Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia Institute of Tropical Aquaculture and Fisheries(AKUATROP) Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia Faculty of Engineering Universiti Putra MalaysiaUPM SerdangSelangor Darul Ehsan43400Malaysia

Implementation of biofloc technology(BFT)system in aquaculture industry shows high productivity,low feed conversion ratio,and an optimum culture *** study was divided into two *** first phase involved maintaining the water quality using the optimum carbon-to-nitrogen ratio by manipulating pH in culture *** second phase examined the performance of harvesting biofloc(remaining phytoplankton and suspended solids in the system)using chicken eggshell powder(CESP).This study showed that pH 7 to 8 were the best biofloc performance with high removal percentage of ammonia(>99%)with a remaining ammonia concentration of 0.016 mg L^(−1)and 0.018 mg L^(−1),*** second phase of this study was performed to determine the optimal formulation and conditions of using CESP as a bio-flocculant in harvesting excess *** use of eggshell showed a higher harvesting efficiency of more than 80%under the following treatment conditions:0.25 g L^(−1)of eggshell dosage;with rapid and slow mixing rates of 150 and 30 rpm,respectively;30 min of settling time;settling velocity of 0.39 mm s^(−1)and pH of 6 to ***,the results indicated that biofloc would be the best green technology approach for sustainable aquaculture wastewater and the CESP is an organic matrix that environmental-friendly bio-coagulant for biofloc harvesting.

关键词： Chicken eggshell aquaculture biofloc coagulant water quality harvesting

Extraction and Characterization of Litopenaeus vannamei’s Shell as Potential Sources of Chitosan Biopolymers

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Journal of Renewable Materials 2023年第3期11卷 1181-1197页

作者： Che Engku noramalina Che Engku Chik Amyra Suryatie Kamaruzzan Ahmad Ideris Abdul Rahim Fathurrahman Lananan Azizah Endut Siti Aslamyah nor azm.n kasan Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)Universiti MalaysiaTerengganuMalaysia East Coast Environmental Research Institute(ESERI) Universiti Sultan Zainal Abidin(UniSZA)Terengganu Darul ImanMalaysia Faculty of Bioresources and Food Industry Universiti Sultan Zainal Abidin(UniSZA)Terengganu Darul ImanMalaysia Faculty of Innovative Design and Technology Universiti Sultan Zainal AbidinTerengganu Darul ImanMalaysia Faculty of Marine Science and Fisheries Hasanuddin UniversityMakassarIndonesia

Chitin is the second most abundant polysaccharide,produced mainly as an industrial waste stream during crustacean *** can be derived into chitosan through the deacetylation *** of shrimp waste into chitosan via the deacetylation process could be considered a practical approach for shell waste *** this study,chitosan’s physicochemical characteristics extracted from two types of Pacific white leg shrimp,***’s shell(i.e.,rough and smooth),were compared with commercial *** yield,moisture,ash,solubility,water and fat binding capacity were *** degree of deacetylation(DDA)was calculated using FTIR,and their chemical Structure was confirmed using XRD and *** extracted chitosan showed no significant difference in yield,moisture,ash,solubility and water binding capacity but showed a significant difference with commercial ***,the fat binding capacity of commercial chitosan showed the lowest percentage(408.34±0.83%)as compared to extracted chitosan(smooth shell 549.59±12.48%;rough shell 500.55±12.10%).The DDA indicated that extracted chitosan from the smooth and rough shell was considered good chitosan as compared to commercial chitosan with 84.08±1.27%,80.78±0.79%and 74.99±1.48%,***,the presence of hydroxyl and amino groups from FTIR and a good crystallinity index was recorded using XRD of extracted *** on observed characteristics,shrimp shell waste from *** can achieve chitosan standard quality as a biopolymer and highly potential to be applied in various industrial applications.

关键词： Chitin chitosan degree of deacetylation L.vannamei shrimp shell surface morphology

A review of gynogenesis manipulation in aquatic animals

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Aquaculture and Fisheries 2022年第1期7卷 1-6页

作者： Hidayah Manan A.B.noor Hidayati nur Aina Lyana Adnan Amin-Safwan Hongyu Ma nor azm.n kasan Mhd Ikhwanuddin Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and FisheriesUniversiti Malaysia Terengganu21030 Kuala NerusTerengganuMalaysia Institute of Biological Science Faculty of ScienceUniversity of MalayaKuala Lumpur50603Malaysia Guangdong Provincial Key Laboratory of Marine Biotechnology Shantou UniversityShantou515063China STU-UMT Joint Shellfish Research Laboratory Shantou UniversityShantou515063China

Gynogenesis is an established technique to generate all female type offspring and this technique has been successfully induced diploid gynogens progeny in aquatic animals of fishes and *** culture of all female shrimp and fishes were selected attribute to all female type offspring which have better size than male and help increase the market size and *** article discusses on the protocol applied to produce gynogens progeny and the successful rate of gynogenesis production in fishes,molluscs and aquatic crustaceans of shrimps in *** most of the UV length applied for irradiated the sperm were around 254-365 nm for(20-40 s),(20-80 s)and(5-8 s)for shrimps,254 nm,30 s for molluscs species and for fishes were around 254 nm for(1.5min)and(2-12 min)time of exposure *** gynogenesis induction,the fertilized eggs were treated with cold shock,heat shock or cytochalasin-B for both shrimp and fishes gynogens *** rate was identified around 4.33%-19.67%in *** hatching rate was identified around 3.0%,14.9%-37.2%of gynogens offspring in shrimp and various percentages of hatching rates were identified from each species of fish ***,there is still low survival rate of gynogens produced using gynogenesis technique and further study should be carried out to improve the gynogens *** discussed protocols serve as a guide lines for the gynogenesis technique application of all female monosex culture in the future.

关键词： UV-Length Irradiated sperm Fertilized eggs Hatching rate Survival rate Gynogens

The Inhibition Effects of Alkoxyl Thiourea Derivatives toward the Growth of Isolated Oscillatoria sp. from Kenyir Lake, Terengganu

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Journal of Environmental Science and Engineering(A) 2015年第8期4卷 389-394页

作者： nor azm.n kasan Siti Zafirah Mohamad Yusof naqiyyu Bazz Ramli Wan M. Khairul Hazlina Ahamad Zakeri Institute of Tropical Aquaculture (AKUATROP) University Malaysia Terengganu Kuala Terengganu 21030 Malaysia School of Fisheries and Aquaculture Science Universiti Malaysia Terengganu Kuala Terengganu 21030 Malaysia School of Fundamental Science Universiti Malaysia Terengganu Kuala Terengganu 21030 Malaysia

In controlling eutrophication phenomenon, there were conventional methods which lead to negative effects to aquatic environment. This study was aimed to investigate the usage of synthesized thiourea compounds to inhibit the growth of Oscillatoria sp. in Kenyir lake, Terengganu, Malaysia. The inhibition effects of four eco-friendly alkoxyl thiourea derivatives compounds named as n-（（4-（decyloxy）phenyl）carbamothioyl）-4-methyl benzamide, n-（（4-（decyloxy）phenyl）carbamothioyl）-4-nitro benzamide, 4-chloro-n-（（4-（decyloxy）phenyl）carbamothioyl） benzamide and n-（（4-（decyloxy）phenyl）carbamothioyl） benzamide were examined onto the growth culture of Oscillatoria sp. These compounds were tested in 30 mL of Oscillatoria sp. cultures with different concentration of 16 μg·mL-1, 18 μg·mL-1, 20 μg·mL-1, 24 μg·mL-1 and 28 μg·mL-1respectively. The treatment flasks were supplied with an aerator for 24 hours under continuous illumination at 25 ℃. Chlorophyll-a concentration were extracted to calculate the inhibition percentage of each treatment. Overall, all these compounds showed inhibition effects towards the growth of Oscillatoria sp., with the highest inhibition of 37% by n-（（4-（decyloxy）phenyl）carbamothioyl）-4-methyl benzamide at the concentration of 18μg·mL-1. The methyl group that attach to the synthesized compound may contribute to the effectiveness of the compound which act as an algae inhibitor. However, extensive studies still need to be conducted in order to investigate the mechanism on how this compound reacts with Oscillatoria sp..

关键词： Eutrophication alkoxyl thiourea Oscillatoria sp. chlorophyll-a inhibition effect.