Generally, the
following conditions exist where spawning Atlantic herring adults are found: water temperatures
below 15° C, depths from 20 - 80 meters, and a salinity range from 32 - 33‰. Herring eggs are spawned in areas of well-mixed water, with tidal currents between 1.5 and 3.0 knots.
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ok ......so you can have a salinity rate of no higher than 33 %
supposedly
next step is to do the hydrology of the water (s) that are in question to check for too high a salinity. Only a company with credentials can do it so that you can present the evidence to the governing body> who prolly ain't concerned about the damned herring.
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