This study was conducted to screen the commercial herbicides for algae control in the aquarium. Three herbicides of ametryn, atrazine and metribuzine were tested at concentrations ranging from 0.625 to 10.00 ppm. It i...This study was conducted to screen the commercial herbicides for algae control in the aquarium. Three herbicides of ametryn, atrazine and metribuzine were tested at concentrations ranging from 0.625 to 10.00 ppm. It is found that ametryn was the most effective herbicide that inhibited algal growth. Ametryn concentration that caused 50% inhibition on algae growth after exposure for 21 days was 0.335 ppm. Survival rate of oruamental fish, Harlequin rasbora （Trigonostigma heteromorpha） and growth rate of aquatic plant （Elodea canadensis） exposed to 10 ppm ametryn were compared with those exposed to algaecide. The result showed that there was no significant difference in survival rate of Harlequin rasbora when exposed to ametryn, algaecide and dechlorinized tap water （control）. However, growth rate of E. canadensis was lower after exposure of ametryn compared to those exposed to algaecide and tap water. These results suggest that ametryn has potential to be used as an algal inhibitor in aquarium.展开更多
The complete quantitative essential amino acid(EAA)requirements of aquacultured animals are largely unknown except for a handful of species.This is problematic because formulation of least-cost diets for target animal...The complete quantitative essential amino acid(EAA)requirements of aquacultured animals are largely unknown except for a handful of species.This is problematic because formulation of least-cost diets for target animals demands precise knowledge of EAA requirements.One way of approximating EAA requirements is to use correlations between whole-body and/or muscle EAA profiles using essential to total EAA ratios(A/E ratios).This method requires a reference,quantified EAA requirement,usually lysine(Lys).To systematically evaluate the A/E ratio method,muscle AA profiles were measured in 10 species of teleost and whiteleg shrimp.In fish,Lys represented the dominant muscle EAA measured,ranging between 7.06 and 9.58 g/100 g protein,whereas,in shrimp,arginine(Arg)was quantified as the principal EAA.For non-EAA,glutamate(Glu)and glutamine were consistently the NEAA recorded at highest levels whereas,in shrimp,Glu+Gln was highest followed by aspartate(Asp)plus asparagine(Asn).Except for Arg,which was twice that of fish(P<0.05),whiteleg shrimp expressed similar muscle A/E profiles.Strength of relationship between muscle EAA levels and known requirements were all strongly and positively correlated for non-salmonid species.When using Lys as the reference EAA there were few semblances between measured and estimated EAA requirements.展开更多
Recirculating Aquaculture System(RAS)is introduced in aquaculture farming industry to reduce water resource utilization,efficient the energy and land uses,and also help minimalize the water exchange.This system enable...Recirculating Aquaculture System(RAS)is introduced in aquaculture farming industry to reduce water resource utilization,efficient the energy and land uses,and also help minimalize the water exchange.This system enables utilization of unsuitable land and promotes a sustainable environment in aquaculture industry.Furthermore,this technology has been established and proved efficient in monitoring the aquatic animal condition subsequently helps in maintaining the water quality and help remove solid particle wastes from the aquaculture treatment.As today,RAS has been developed with more effective technologies such as the use of UV irradiation,solid capture,protein skimmer and also provided with highly techno bio-filtration set.Basically,this system was applied for broodstock maturation,nursery phase,and grow-out production.In this review article,we provide an overview of RAS between the clear water,probiotic,and biofloc technology,and the advantages of its combination.Even though RAS and biofloc is two different parallel system,the application of the probiotic and biofloc in the semi-RAS application system is intense to be investigated.The synergistic effect of RAS using this combination towards high yield aquaculture production will be highlighted in this review paper.Expectantly this review paper will generate awareness and useful information on the RAS application in the aquaculture system operation with help in maximize the impact to the aquaculture yield production.展开更多
文摘This study was conducted to screen the commercial herbicides for algae control in the aquarium. Three herbicides of ametryn, atrazine and metribuzine were tested at concentrations ranging from 0.625 to 10.00 ppm. It is found that ametryn was the most effective herbicide that inhibited algal growth. Ametryn concentration that caused 50% inhibition on algae growth after exposure for 21 days was 0.335 ppm. Survival rate of oruamental fish, Harlequin rasbora （Trigonostigma heteromorpha） and growth rate of aquatic plant （Elodea canadensis） exposed to 10 ppm ametryn were compared with those exposed to algaecide. The result showed that there was no significant difference in survival rate of Harlequin rasbora when exposed to ametryn, algaecide and dechlorinized tap water （control）. However, growth rate of E. canadensis was lower after exposure of ametryn compared to those exposed to algaecide and tap water. These results suggest that ametryn has potential to be used as an algal inhibitor in aquarium.
文摘The complete quantitative essential amino acid(EAA)requirements of aquacultured animals are largely unknown except for a handful of species.This is problematic because formulation of least-cost diets for target animals demands precise knowledge of EAA requirements.One way of approximating EAA requirements is to use correlations between whole-body and/or muscle EAA profiles using essential to total EAA ratios(A/E ratios).This method requires a reference,quantified EAA requirement,usually lysine(Lys).To systematically evaluate the A/E ratio method,muscle AA profiles were measured in 10 species of teleost and whiteleg shrimp.In fish,Lys represented the dominant muscle EAA measured,ranging between 7.06 and 9.58 g/100 g protein,whereas,in shrimp,arginine(Arg)was quantified as the principal EAA.For non-EAA,glutamate(Glu)and glutamine were consistently the NEAA recorded at highest levels whereas,in shrimp,Glu+Gln was highest followed by aspartate(Asp)plus asparagine(Asn).Except for Arg,which was twice that of fish(P<0.05),whiteleg shrimp expressed similar muscle A/E profiles.Strength of relationship between muscle EAA levels and known requirements were all strongly and positively correlated for non-salmonid species.When using Lys as the reference EAA there were few semblances between measured and estimated EAA requirements.
基金the HICoE outcome project entitle"Indoor Multi-Techno Aquaculture System(IMTAS)",funded by the Ministry of Higher Education(MOHE),Malaysia under Higher Institution Centre of Excellence(HICoE),Institute of Tropical Aquaculture and Fisheries(AKUATROP),Universiti Malaysia Terengganu program[Vot.No.63933,JPT.S(BPKI)2000/016/018/015Jld.3(23)and Vot.No.56050,UMT/PPPI-2-2/5 Jld.2(24)].
文摘Recirculating Aquaculture System(RAS)is introduced in aquaculture farming industry to reduce water resource utilization,efficient the energy and land uses,and also help minimalize the water exchange.This system enables utilization of unsuitable land and promotes a sustainable environment in aquaculture industry.Furthermore,this technology has been established and proved efficient in monitoring the aquatic animal condition subsequently helps in maintaining the water quality and help remove solid particle wastes from the aquaculture treatment.As today,RAS has been developed with more effective technologies such as the use of UV irradiation,solid capture,protein skimmer and also provided with highly techno bio-filtration set.Basically,this system was applied for broodstock maturation,nursery phase,and grow-out production.In this review article,we provide an overview of RAS between the clear water,probiotic,and biofloc technology,and the advantages of its combination.Even though RAS and biofloc is two different parallel system,the application of the probiotic and biofloc in the semi-RAS application system is intense to be investigated.The synergistic effect of RAS using this combination towards high yield aquaculture production will be highlighted in this review paper.Expectantly this review paper will generate awareness and useful information on the RAS application in the aquaculture system operation with help in maximize the impact to the aquaculture yield production.
