Waterways Further Impacted?

Several residents have observed that the clams, oysters - namely any hard-shelled mollusk - that are attached to our seawalls are falling off. In the observed areas, at and above the median water line the mollusks appear to remain, while below all mollusks appear to have fallen off.

(click image to enlarge)

Image of seawall - wiped of shell life where dewatering has recently occurred. Also, note slime on surface as also reported by residents.

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(click image to enlarge)
Image of seawall - wiped of shell life where dewatering has recently occurred. At waterline, shells, below, no shells and new grass growth.

While we claim no connection - merely an observation - all of the areas where the dewatering effluent was dumped into the waterways exhibit this anomaly. But yet in other areas where dumping the dewatering effluent into the waterways has not yet occurred, the mollusks appear to be intact.

(click image to enlarge)
Image of seawall with population of shell life where no dewatering has occurred.

It is unknown if this observation is simply the noting of a natural cycle, the result of some unusual though known phenomena (e.g.. red tide), or the results of dumping hydrogen sulfide/sulfuric acid laced effluent into the waterways.

We put forth this confirmed observation in the hope that those with marine biology or similar background can opine on this issue.