Open AccessIdentification of the annual catch and fishing measures that ensure the optimal fishing of narrow-clawed crayfish Pontastacus leptodactylus in the waterbodies of Belarus
Author(s) -
А. В. Алехнович
Publication year - 2019
Publication title -
vescì nacyânalʹnaj akadèmìì navuk belarusì. seryâ bìâlagìčnyh navuk
Language(s) - English
Resource type - Journals
eISSN - 2524-230X
pISSN - 1029-8940
DOI - 10.29235/1029-8940-2019-64-3-277-285
Subject(s) - crayfish , rostrum , fishery , fishing , biology , telson , crustacean , ecology , decapoda , genus
An annual catch of 45 % of the commercial stock is recommended on the basis of productivity and mortality of mature individuals. Commercial stock is made up of individuals with a total length of ≥ 10.5 cm (from the tip of the rostrum to the end of the telson, TL). Female individuals of narrow-clawed crayfish participate in 1–2 reproduction periods before they reach the commercial stock value of 10.5 cm. Crayfish individuals of 12 cm TL at the age of 5 years have the maximum observed growth rate. At the age of 3 years, crayfish individuals have the maximum observed cohort biomass (a group of evenaged individuals).