Aquatic Biology and Ecology »
Fish Population Studies
Fish abundance and distribution studies are a focus of NSC's work, and we are equipped to conduct surveys in freshwater, estuarine and marine environments. Our biologists use a number of techniques to study juvenile and adult fish populations, including but not limited to: index gillnets; boat and backpack electrofishers; egg mats; drift traps; trapnets; and seines. Biological data collected from captured fish includes length (fork or total), round weight, sex and maturity, and DELT (deformity, erosion, lesions and tumors) identification. Sampling includes removing tissues for ageing, dietary, contaminant, and genetic analyses. Spawning success, which is essential to population survival, can be measured by egg deposition and larval drift. Mark and recapture techniques are used to generate data for population estimates and modelling.