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It may be due to the large amount of nutrient rich ground water now showing up in seepage due to old septic systems and large scale development
Approximately 80% of the nitrogen that enters the watershed comes from these private septic systems, and the remainder from other non-point sources. The effect is nutrient or nitrogen loading of the surrounding watershed above the critical load. Various species of plants and animals which inhabit estuaries cannot tolerate this level of nutrient loading, because it spawns a large amount of bottom algae, over-shading of eelgrass, and, ultimately, a depletion of oxygen in and an increase in the toxicity of the water. Each of these effects will send fish to other feeding grounds, while killing plants and animals that live on or in the ocean floor.
Could be the first signs.......
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