Rumeaida Mat Piah, PhD is a Lecturer at School of Fisheries and Aquaculture Sciences, University Malaysia Terengganu, Malaysia. She is a member in Malaysian Fisheries Society. Her research mainly on fish population dynamics in relation to fisheries management. Her special research experiences are on the population characteristics of fish, marking and tagging of fish by PIT tags and Acoustic tags to identify population size, growth rate and migration pattern, the diet and feeding habits of fish, fish diversity and abundance and reproductive aspects but she is particularly interested in determining the age of fish through observation on the sectioned otoliths and the length frequency distributions. These two simple and chemical free techniques derived so much valuable information in order to have a clear picture on their current and future status. Age and growth information are also the key element in stock assessment and in developing a management and conservation plan of fish resources.