Effect of temperature on the development of eggs and the daily pattern of spawning of round herring <Emphasis Type="Italic">Etrumeus teres</Emphasis> |
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| Authors: | Shinji Uehara Takumi Mitani |
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| Institution: | (1) Tohoku National Fisheries Research Institute, Shinhama, Shiogama Miyagi, 985-0001, Japan;(2) National Research Institute of Fisheries Science, Fukuura, Kanazawa, Yokohama Kanagawa, 236-8648, Japan |
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| 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. |
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| Keywords: | Daily pattern Egg development Round herring Spawning Temperature |
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