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Joined: Mar 2005
Posts: 21,546 Likes: 284
Moderator Hall of Fame 2014 Lunker
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Moderator Hall of Fame 2014 Lunker
Joined: Mar 2005
Posts: 21,546 Likes: 284 |
Most pond fish require both the right photo period and temp to spawn. For example "
" Sunfish spawn several times after water temperatures reach 21°C (Dupree and Huner 1984).
The suitable temperature range for reproduction
by bluegill L macrochirus is 20-30°C (Breder and
Rosen 1966; Banner and Hyatt 1975). Reproduction
also requires a period of 12-16 h light (West
and Hester 1966: Banner and Hyatt 1975). ...
Female bluegills
began spawning within 3 months of the initiation
of the water temperature and photoperiod
regimes, and several females spawned more than
once (up to five times per female) over a 5-month
period. "
" In a descriptive study of a closely
related species, Lepomis macrochir•s, James
(1946) described a period of gonadal quiescence
during the winter followed by a period
of active gametogenesis in the spring, concomitant
with the seasonal increases in daylength
and temperature."
This occured about every 28 days after the required temp and photoperiod were reached.
How moon phase fits in biologically I don't know. I do know I have observed many times the peak spawning activity occurring on the full moon in the mths when the photo period and water temps are optimally reached. I addition I have read accounts in studies by fisheries biologists confirming those observations.
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