As we approach the end of May we begin to see fish who use the estuary intermittently as a breeding ground. Among the fish who stay briefly in the estuary the shiner perch has shown up in the thousands, along the main estuary a typical seine will net several dozen. The shiner perch prefer warm temperatures (14C) and very shallow water for breeding.
An interesting fact about shiner perch is that stress due to beach seining can cause them to give birth in the net. They produce live young and will give birth to tens of juvenile perch that are essentially fully functional fish.
http://en.wikipedia.org/wiki/File:Cymatogaster_aggregata_female.jpg
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