Abstract:
Background and Objective: Water quality problem would affect aquatic life described as the conditions of water, including chemical, physical, biological and aesthetic (appearance and smell) characteristics. This paper thus discusses on the effects of water parameters towards the mortality rate of the river catfish (Pangasius Hypopthalmus) larvae and henceforth, aims to identify factors affecting this catfish using exponential models. Materials and Methods: Data were collected from the Borneo Marine Research Institute (BMRI) in Universiti Malaysia Sabah which involves innovative research and dissemination of knowledge in aquaculture and marine sciences. This study was conducted for 15 days on 5 fish tanks with different salt concentrations and each had 200 fish larvae. Cubic spline interpolation was performed on the data missing values. Mathematical modelling procedures were applied involving the listing of all possible models, non-linear model transformation to linear models, selected models after multicollinearity and coefficient tests, best model selected based on the 8 selection criteria (8SC) and the goodness-of-fit (GOF) of the best model. Results: Comparisons of the best models between the tanks was made and it was found that best model was