The study tried to determine the water quality in Bay Laguna as basis for quantity and quality of fish caught per unit effort and to propose a Laguna de Bay Water Rehabilitation Plan to be used for controlling the continued deterioration of water quality that affects the quantity and quality of fish. The respondents of the study were knowledgeable and capable of answering the questionnaire and interviews. The local community may benefit from this research being a part of the rehabilitation program and from the livelihood program to be developed by the LGUs. The fishermen and the local government unit can develop a plan on how they will provide a good quality of water as a basis for the acceptable quantity/quality of fish they can catch per unit effort in the lake. Analysis revealed that the Phosphate as PO4-P, Nitrate (as NO3-Nitrogen), Chloride, and Lead of the water analysis has a direct relationship to the appearance, odor, and quantity of the fish caught in Laguna De Bay. It was found that there is a significant relationship between the laboratory results and the quantity/quality of fish catch per unit effort and the quality of water.