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- Title
Impact of Temperature Variations on Breeding Behavior of Cirrhinus mrigala during Induced Spawning.
- Authors
Khan, Saeed Akram; Sherzada, Shahid; Ashraf, Muhammad; Durr-e-Shehwar; Iqbal, Sonia; Atique, Usman; Abbas, Farzana; Ahmad, Sohail; Haider, Muhammad Sultan
- Abstract
Cirrhinus mrigala naturally breeds in rivers and streams during monsoon season but in ahatchery, it can be induced to spawn by the administration of ovaprim or its analogues. However, the conditions of the induced environment vary from place to place as well as the dose of ovaprim. The present investigation is focused on possible impact of different temperatures on the induced spawning behavior of C. mrigala. The factors investigated include the ovulation time, embryonic and larval development, and yolk sac absorption induced at 4 different water temperatures viz. 26, 29, 32 and 34 °C. C. mrigala displayed the maximum release of eggs, fertilization and hatching rates at 29 °C. The maximum number of eggs were observed in 26oC whereas the lowest were obtained in 34oC. 85020.48). However, the temperature exceeding 30°C not only increased the cell growth but significantly decreased the hatching time. On the contrary, temperature exceeding 32°C caused denaturation of all eggs and larvae that resulted in reduced hatching rate. Microscopic examination revealed that eggs were more influenced by high temperature at early stages of development. Impacts of slight change in water temperature were observed from Blastodisc to morula stage. After gastrula stage, temperature effects were evident but not critical. This was a first documented report on effects of temperature on breeding performance and embryonic development of C. mrigala from Pakistan.
- Subjects
PAKISTAN; ANIMAL sexual behavior; YOLK sac; FISH spawning; EMBRYOLOGY; WATER temperature; SPAWNING; OVULATION; TEMPERATURE effect
- Publication
Pakistan Journal of Zoology, 2022, Vol 54, Issue 4, p1877
- ISSN
0030-9923
- Publication type
Article
- DOI
10.17582/journal.pjz/20200510140530