Iga võrgukanga silma suurust mõõdetakse kümnes erinevas kohas, kusjuures tihedatel võrkudel mõõdetakse igas kohas kaugust esimesest üheteistkümnenda sõlmeni, tihedatel võrkudel esimesest kuuenda sõlmeni. Otsitav silma suurus saadakse kõigi sõõtmiste summa jagamisel 100 või 50-ga.
There is an increasing tendency to use smaller and smaller mesh sizes for bottom set gillnets, entangling nets and trammel nets, which is resulting in increasing mortality rates for juveniles of the target species of the fisheries concerned. This trend should be checked and the mesh sizes used for passive gear such as bottom set gillnets, entangling nets and trammel nets should be designed to achieve selective catches of the target species or group of target species.
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