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Tigerstripe said:
Fish can be artificially induced to spawn twice a year by covering the raceways, using artificial light, and taking them through an annual light cycle in six months.

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Interesting. I didn't know that, but I'm not surprised.

A friend built a small greenhouse some years back. At first, he was disappointed to find that summer vegetables wouldn't grow well in there in the winter, even though the temperature, water, and soil were right. He had to add grow-lights and a timer, regulating the length of daylight to make tomato plants and other veggies "think" it was June, July, then August. Now they grow like crazy.

I think fish and the rest of nature are the same way. Weather, temperature, and water levels may affect the details and duration of each year's spawn - but the length of daylight is the most important thing that sets it off.

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