Much of the focus of aquatic science research over the past half centuryhas been on the over enrichment of inland waters – I.e. Eutrophication.The antithesis of eutrophication is under under-enrichment or oligotrophicationtha that has only recently received attention of aquatic scientists. There areseveral causes of oligotrophication, briefly discussed in this discourse,that either individually or collectively have led to a gradual decline incarbon (C) production in lakes/reser reservoirs and rivers and to a loss of fishvoirs production, worldwide. I draw the attention of the lay public, resourcemanagers, and policy makers to some of the perils of oligotrophication ofaquatic ecosystems, and offer suggestions for better recycling and reu reuse seof nutrients, most notably phosphorus (P), to attempt to reverse thisprocess in affected ecosystems with low ambient production andbiodiversity and restore fisheries production to optimal levels. Over thepast 2 decades many lakes and streams in Brit British Columbia have beenish fertilized with nitrogen (N) and P and all have shown marked increasesof production at all trophic levels following supplementation. Thisincrease in fisheries production has resulted in higher adult salmonreturns worth several mi millions of dollars to fisheries llions fisheries-based economies.
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