2019-04-022019-04-021991NAGA 14 (3): 6-7https://hdl.handle.net/20.500.12348/3067The need to estimate percentages and/or numbers occurs frequently during practical research work; accurate but rapid estimates can be useful when planning research programmes. Charts are provided that may be used as a visual aid to estimating numbers of animals/plants in a specific situation, for example, the number of fish fry in a subsample from a hatchery tank, or the percentage composition of a sample such as the percentage algal cover in a pond.application/pdfCC BY 4.0Journal Article