User:Kienekm/sandbox

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-Behavioral effects Chinook previously-exposed to diazinon continued to be active and feed in the presence of an alarm stimulus that represented a potential predator. Normal anti-predator behavior exhibited by controls included freezing, reduced food capture, and movement to lower areas of the water column. Diazinon-exposed salmon parr would be at higher risk to predation. -Reproduction Reduced production of milt and plasma sex hormones in males due to the inability to -detect the female salmon priming pheromones -Population Survival and reproductive success of Pacific Northwest salmon may be lower in streams contaminated with neurotoxic pesticides such as diazinon These chemicals are most common in urban and agricultural watersheds, thus salmon populations in these areas may be affected. Delayed spawning in blue gill exposed to a pyrethroid was thought to be a result of disruption to the synchronization of spawning between the sexes signaled by pheromones. Delayed spawning readiness in males has the potential to impact reproduction in populations. The effect of pesticides on homing ability may increase straying, in which fish do not return to their natal streams to spawn, can lead to colonizing new habitats, but it can also diminish genetic integrity or the number of spawning animals of the original stream.