Optimized Sampling Strategies for Identifying Modes in Length-frequency Distributions |
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| Authors: | Warsha Singh Gudmundur Thordarson Sisira Haputhantri Gunnar Stefansson |
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| Institution: | 1. Department of Mathematics, Science Institute, University of Iceland, Taeknigardur, Reykjavik, Iceland;2. Marine Research Institute of Iceland, Reykjavik, Iceland;3. Marine Biological Resources Division, National Aquatic Resources Research and Development Agency (NARA), Colombo, Sri Lanka |
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| Abstract: | An approach to evaluate sampling strategies to detect modes in length-distributions is presented. Distributions based on various numbers of samples (S) and sample sizes (n) were simulated from the original cod and capelin data in Icelandic waters, incorporating within sample correlations. A peak was discerned if the difference between any simulated and original distribution did not exceed a pre-specified Δ, given a probability. This was achieved with numerous combinations of S and n, and the optimal choice will depend on the sampling costs. Variance-equivalence curves also illustrate the difference between demanding precision of mean lengths versus precision of length distributions. |
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| Keywords: | Fisheries Length distribution Optimal Sampling |
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