TAILIEUCHUNG - Embryonic development of discus, Symphysodon aequifasciatus Pellegrin, 1904 in Indian condition

The experiment was conducted to investigate the embryonic development of discus (Symphysodon aequifasiatus) and determine the time required for major egg developmental stages and hatching. Regular observations were made using optical microscope and the images were recorded using a digital camera attached to the microscope. Important water quality parameters were kept optimal for the hatching of discus eggs. | 2020 9 6 2170-2177 International Journal of Current Microbiology and Applied Sciences ISSN 2319-7706 Volume 9 Number 6 2020 Journal homepage http Original Research Article https Embryonic Development of Discus Symphysodon aequifasciatus Pellegrin 1904 in Indian Condition Sambid Swain1 2 Paramita Banerjee Sawant1 J. K. Sundaray3 E. M. Chhandaprajnadarsini4 and Milind B. Katare1 1 ICAR-Central Institute of Fisheries Education Mumbai India 2 Centurion University of Technology and Management Odisha India 3 ICAR- Central Institute of Freshwater Aquaculture India 4 ICAR-Central Marine Fisheries Research Institute Kochi India Corresponding author ABSTRACT The experiment was conducted to investigate the embryonic development of discus Symphysodon aequifasiatus and determine the time required for major egg Keywords developmental stages and hatching. Regular observations were made using optical microscope and the images were recorded using a digital camera attached to the Embryology Hatching microscope. Important water quality parameters were kept optimal for the hatching of Development discus eggs. Newly laid eggs were oval-shaped and yellow in colour with an average Discus diameter of mm. The embryonic development of fertilized eggs was divided into 16 stages and the development of each stage was recorded in times lapse. The result Article Info revealed that cleavage occurred after 1hr after fertilization followed by development of blastula and gastrula at hr and 24 hr after fertilization respectively. The period of Accepted 18 May 2020 organogenesis started with the formation of embryonic notochord from hrs after Available Online fertilization. The appearance of a defined head and tail of the embryo with 19 somites was 10 June 2020 observed at hrs after fertilization whereas heart beat along with blood circulation appeared after hrs after fertilization. The eggs

• Ngư nghiệp
• Embryonic development of discus
• Hatching of discus eggs
• Embryonic development of discus
• Investigate the embryonic development
• Water quality parameters
• River yamuna
• Water quality
• Seasonal variations
• Water quality parameters of river Yamuna
• Dissolved oxygen
• Primary parameters
• Secondary parameters
• Irrigation water quality index
• Irrigation water quality status
• Labeo rohita (Hamilton) Culture Tanks
• Water quality parameters in rohu
• Biofloc on water quality parameters
• Laboratory conditions in triplicates
• BOD when compared to control
• Physical and chemical parameters
• Water standards
• Clean water
• Monitoring supplied domestic water quality
• Quality parameters
• Nutrient content and uptake
• Saline water
• Canal water
• Integrated nutrient management
• River pollution
• Water quality monitoring
• Yamuna river by
• GIS based water quality index in Delhi
• Selected parameters
• Nitrificationdenitrification bacteria
• Most probable number method
• Sediment pore water
• Spring originated shallow pond sediment
• Evaluation of bacteria abundance
• Sediment water quality parameters
• Substrate based biofloc systems
• Water parameters
• Hematological parameters
• C/N ratio
• Nile tilapia Oreochromis niloticus
• Physcio chemical
• Thematic maps
• GIS and WQI
• Ground water quality parameters
• GIS technique based
• Water quality of Ba Lat estuary
• Ba Lat estuary
• Physio chemical parameters
• Heavy metal
• Total oil and grease
• Process of environmetal water quality
• O Loan lagoon
• Exchange capacity of water
• Environmental parameters
• NTR 102008
• Grey water
• Feasibility for irrigation
• Characterization of grey water
• Grey water to assess
• Physico chemical parameters
• Kanigiri reservoir
• Studies on physico chemical parameters
• Downstream were also analysed
• Sai Gon Dong Nai River
• Water Quality Index
• Physico chemical
• Microorganism parameters
• Physicochemical parameters
• Water quality analysis
• Surajpur wetland
• National capital region
• Physicochemical characteristics of water samples
• Surface water quality
• Surface water affected
• Apatite mining Activity
• Temporal spatial variation
• Environmental quality parameters
• COD and total coliform population
• Total coliform population
• Madurai municipal corporation
• Biological quality parameters
• Vembanad lake
• Panangad Kumbalam
• Physico chemical characteristics
• Vembanad lake at Panangad kumbalam region
• Macroinvertebrate fauna
• Cirhanyobowa river
• Biological index
• Pollution indicators
• Neem leaf extract
• Tulasi leaf extract
• Coconut water
• Chickpea (Cicer arietinum L
• Priming on growth
• Stable isotope ratio
• Stable isotopes ratio combined
• Nitrogen nutrient sources
• Aquatic environment
• Combined experimental ozone
• Probiotics in tiger prawn
• Penaeus monodon
• The variation in water quality
• Surveyed parameters