Abstract
Temperature is a limiting factor to the development of fish eggs and larvae. The aim of this study was to define the optimal temperature for egg incubation, larval survival and development of Sardinella brasiliensis larvae. Eggs were obtained by natural spawn and collected after the blastopore enclosure. Fertilized eggs were incubated at 17, 20, 23, 26 29 or 32°C in beakers. Larval development (200 eggs L−1), hatching and survival rates (100 eggs L−1) and RNA/DNA ratio were evaluated. The best temperature for hatching was 28°C, the best survival rate was obtained at 24.7°C, and 100% of the larvae died at 18.4°C. The time of mouth opening (24 to 51 h) and moment of eye pigmentation (24 to 45 h) varied with temperature. No significant difference was found in the RNA/DNA ratio between the treatments, indicating the nutritional status of the larvae. The interval between 24.7 and 28°C resulted in a better hatching rate and larval survival. Water temperature affected the hatching rate, survival and morphometric development of S. brasiliensis larvae.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
