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- Title
Effect of temperature on the development of eggs and the daily pattern of spawning of round herring Etrumeus teres.
- Authors
Uehara, Shinji; Mitani, Takumi
- Abstract
Effect of temperature on the development of eggs of round herring Etrumeus teres was experimentally examined to construct a temperature-dependent egg development model. Mature fish were collected in the field and their eggs were artificially fertilized onboard. The eggs were incubated at nine temperatures set between 14.0 and 25.0°C. All eggs at the lowest three temperatures, 14.0°C, 15.0°C, and 16.0°C, ceased development and died at various stages before hatching. Durations required to hatching after fertilization ranged from 38.0 h at 25.0°C to 90.0 h at 17.5°C. The temperature-dependent egg development model, i.e., egg age in hours ( y i, t ) at the ith stage and temperature t (°C), was expressed as: y i, t = 4.604 × exp(−0.100 × t −0.129 × i) × i 2.593. From the application of the model to early-stage eggs collected in the field, it is concluded that round herring starts spawning immediately after sunset and almost completes spawning by midnight. The temperature-dependent egg development model and the daily pattern of spawning presented in this study are essential tools for developing the daily egg production method to estimate the spawning stock biomass.
- Subjects
ETRUMEUS; CLUPEIDAE; FISH spawning; FISH reproduction; EFFECT of temperature on reproduction; HATCHABILITY of eggs; BIOMASS; FISH research; AQUACULTURE
- Publication
Fisheries Science, 2009, Vol 75, Issue 1, p159
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1007/s12562-008-0014-8