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Laboratory Growth of <i>Anopheles gambiae</i>(Diptera: Culicidae) and Morphological Determinism of moulting

Advances in Entomology 2021年第4期9卷 176-185页

作者： Henri Gabriel Tsila Patrick Akono Ntonga Alvine Larissa Meyabeme Elono Timoleon Tchuinkam Mpoame Mbida Biology and Applied Ecology Unit Researches Department of Animal Biology Faculty of Science University of Dschang Dschang Cameroon Vector Borne Infectious Diseases Laboratory Department of Animal Biology Faculty of Science University of Dschang Dschang Cameroon Biology and Physiology of Animal Organisms Laboratory Department of Animal Organisms University of Douala Douala Cameroon Forestry Department Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon

Growth in arthropods in general and in insects in particular, is supposed to be discontinuous and occurs during moulting. In Culicidae in general and Anopheles in particular, the number of moults is five with the fourth which gives the pupae. It is known that moulting in insects is a genetic and physiological phenomenon. Most physiological reactions are triggered by chemical or physical stimuli. The pressure exerted by the growth of the larval body on the exocuticle is one of the triggers of moulting. The objective of this work was therefore to determine the exact timing of the first three moults that determine the growth of An. gambiae larvae from egg hatch to pupation to highlight the role of increased larval size in the stimulation of moulting. We therefore, undertook to rear larvae of this anopheline species in the laboratory under conditions close to their natural environment from hatching to pupation. The length and width of the head, thorax and abdomen were recorded daily. Data analysis showed that the size of the head and thorax remained constant for the first three days (D0 to D2) of development and abdomen’s length for the first two days and then increased daily until day seven (D7) when it stopped. These observations led us to say that the M1 moult occurs at end of the third day of development and the M3 moult at end of the eighth day;the M2 moult could not be determined. All these observations led to the conclusion that the larval growth of An. gambiae has a c

关键词： Anopheles gambiae Larva Growth Determinism Body Sizes moulting

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Effects of salinity on survival,feeding behavior and growth of the juvenile swimming crab,Portunus trituberculatus(Miers,1876)

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Chinese Journal of Oceanology and Limnology 2015年第3期33卷 679-684页

作者：申屠基康徐永健丁张妮 School of Marine Sciences/Key Lab of Applied Marine Biotechnology of MOE Ningbo University Ningbo Academy of Ocean and Fishery

Effect of salinity on survival,feeding behavior and growth of juvenile swimming crab P ortunus trituberculatus was investigated under 5 salinity levels of 5,10,20,30 and 40. The results show that the crab juveniles fed 2 or 3 times at the salinity 20 and 30,each lasted for about 25 minutes,for a total feeding time of 73.2±22.65 minutes per day. At these salinities,there were significantly higher in the frequency of feeding and in total feeding time than those at lower salinities of 5 and 10. All crab juveniles moulted when reared at a salinity of 20 during the 5 days duration of the experiment,which is significantly higher than those at other salinities. All juveniles survived at salinity 20,and the survivorship was not significantly different from that at 30,but was signif icantly higher than those at other salinities. The crab juveniles reared at a salinity of 20 had the highest value of food ration of 0.190 8±0.011 3 g/g BW,average body weight gain of 0.796±0.128 g,gain rate of 87%–96%,and food conversion ratio of 1.20±0.09. There was no significant difference in the values found between 20 and 30 but these values were significantly lower than that at the other salinities( P> 0.05). Highest activities of digestive enzymes(Amylase,Protease,Lipase) and lowest activities of protective enzymes(SOD,PO,CAT) were also obtained on crab juveniles reared at salinity of 20.

关键词： swimming crab salinity feeding behavior moulting growth mortality

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Amino acid compounds released by the giant freshwater prawn Macrobrachium rosenbergii during ecdysis:a factor attracting cannibalistic behaviour?

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2020年第10期21卷 823-834页

作者： Abu Seman JUNETA-NOR Noordiyana Mat NOORDIN Mohamad Nor AZRA Hong-yu MA Norainy Mohd HUSIN Mhd IKHWANUDDIN institute of Tropical Aquaculture and Fisheries Universiti Malaysia TerengganuKuala NerusTerengganu 21030Malaysia Faculty of Fisheries and Food Sciences Universiti Malaysia TerengganuKuala NerusTerengganu 21030Malaysia Guangdong Provincial Key Laboratory of Marine Biotechnology Shantou UniversityShantou 515063China STU-UMT Joint Shellfish Research Laboratory Shantou UniversityGuangdong 515063China

Ecdysis is a comm on phe nomenon that happe ns throughout the life phase of the giant freshwater prawn Macrobrachium *** is vital to better understand the correlation between cannibalism and biochemical compound that exists during the moulting *** objective of the present study was to determine the amino acid profile released by *** during the ecdysis process that promotes *** accomplish this,changes in amino acid levels(total amino acid(TAA)and free amino acid(FAA))of tissue muscle,exoskeleton,and sample water of culture medium from the moulting(E-stage)and non-moulting(C-stage)prawns were analysed using highperformanee liquid chromatography(HPLC).Comparison study revealed that among the TAA compounds,proline and sarcosine of tissues from moulting prawn were found at the highest *** level of FAA from water that contains moulting prawns(E-stage)was dominated by tryptophan and *** values obtained in the present study suggested that these amino acid compounds act as a chemical cue to promote cannibalism in *** during *** knowledge of compositions and compounds that were released during the moulting process should be helpful for better understanding of the mechanism and chemical cues that play roles on triggering cannibalism,and also for future dietary man ipulati on to improve feeding efficie ncies and feeding man agement,which in directly impacts productivity and profitability.

关键词： Amino acid compound Cannibalism Chemical cue Giant freshwater prawn moulting

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