You get to the POPCHAR table by clicking on the Population dynamics button in the BIOLOGY window and the Max. Length distribution of tropical fishes vs. We anticipate many ways for the data in this table to be used, e.g., for testing hypotheses from life-history theory.įig. The table contains over 1,800 records for over 1,000 species extracted from over 500 references.įishBase users may consider this our answer to the Guinness Book of World Records (Foot 2000). Our answer to the Guinness Book of World Records We have never before seen plots of this kind for fishes, and we look forward to your opinions on their interpretation and potential applications. log(length), with modes characterizing fishes in general (the typical fish species reaches a maximum length of about 25 cm see peak of upper curve) and any group of interest (bold line). 16) far more interesting than its linear version: this generates what appears to be normal distributions of log(numbers) vs. Using log(length) leads to a graph (see Fig. The maximum length of fishes, however ranges from 1 cm (in e.g., gobies) to 14 m (in the whale shark Rhincodon typus), and using class intervals of, e.g., 50 cm (which would generate a suitable number of classes) would cause most fish species to occur in the smallest class, with most others being empty. Thus, to be interpretable, histograms must have constant class intervals (here of length), and the number of classes must be neither too low, nor too high (i.e., 15-30, see Sokal and Rohlf 1995). Plotting histograms of the frequency of species against their maximum length, and interpreting the results seems to be a rather straightforward thing, but it is not. The distribution of maximum lengths among fish species. The POPCHAR table also indicates whether the L max, W max and t max values or various combinations thereof refer to the same individual fish.īox 14. The largest values from this table are also entered in the SPECIES table. This table presents information on maximum length (L max ), weight (W max) and age (t max) from various localities where a species occurs.
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