Ársrit Fiskifélags Íslands - 01.01.1933, Qupperneq 78

Ársrit Fiskifélags Íslands - 01.01.1933, Qupperneq 78
76 within certain limits. The size-class in net-fish, which the nets take in quantity, is larger, compared with the corresponding group in the longline-fish, than any other group in the net-fish, compared with the corresponding group in the longline-fish. If we compare the figures in the columns »net« and »lóð« we find that the nets take the class-size of 105—109 cm. in quantity, and therefore we put the figures 12 = 100 in column »Ióð a« and the figure 29' = 100 in the column »net b«, and work out all the other figures in each column in proportion to the percentages of 12 and 29 respectively, and thus we get the figures in the columns »lóð a« and »net b«. If you work out each figure in the column »net b« in percentage of the corresponding figure in the column »lóð a«* one gets the figures in column X = b : a • 100, and they show how great a percentage of every class the nets take. The figures in. the column 100 :X are reciprocal with the figures in the column, X = b : a 100, and therefore a length-distribution graph for net-fisb can be made similar to the one for longline-fish, by multiplying" the figures in the former scale by the figures in the column X: 100. Then you will get the figures in the last column. If no' fish had escaped from the nets, that is, if they had workedi quantitatively, then 300 square metres of net would represent a longline of 1000 hooks. The otoliths of the catfish serve to give an indication of agef at least in young fish. The age of a few catfish was investigated through the otoliths, with the result shown in table 53. Hr = females. Hœ — males.
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