| Summary: | The study assessed the species composition and abundance of crustaceans and its implications towards the water quality of Lake Oro, Esparanza, Agusan del Sur. Selected physico-chemical parameters were determined to support the presence of bio-indicator freshwater crustaceans.Low species richness and abundance were recorded in the Lake. Three species of decapods- Palimonidae sp. ( Palimonidae) ,Pandalus borealis (Pandalidae) , and Cambarellus sp. ( Cambaridae) were collected. These species were benthopelagic, swimming and burrowing freshwater shrimps and crayfish. Palaemonid sp. was most abundant and Cambarellus sp. was least abundant. All the physico- chemical parameters were within the acceptable range except for pH. Soil pH was within optimum range. Organic matter and phosphorus (P) were very deficient and deficient respectively. Only potassium (K) was sufficient compared to standards. Freshwater species such as crustaceans were under a greater level of threat. The patterns of threat were due anthropogenic activities, pollution, degradation, and overexploitation.
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