{"refrec":{"BRefID":76651,"RR":"<b>Rijnsdorp, A.D.</b> (1989). Maturation of male and female North Sea plaice (<i>Pleuronectes platessa</i> L.). <i>ICES J. Mar. Sci./J. Cons. int. Explor. Mer 46(1)</i>: 35-51","BEntID":72245,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>ICES J. Mar. Sci./J. Cons. int. Explor. Mer 46(1)</i>: 35-51","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rijnsdorp, A.D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rijnsdorp, A.D.","Englishabstract":"The maturation of North Sea plaice is studied on the basis of two research-vessel surveys and market-sampling data from the commercial fisheries. In female plaice the juvenile-adult transition occurred between May and September. Development of the female gonad took place between July and December, although the gonad did not gain weight before October. Gonad weight reached a maximum of circa 17% of the gutted body weight between January and March. The average female plaice was in spawning condition for about five weeks from late January to early March. Male plaice were in spawning condition for at least 11 weeks from the second half of December to the second half of March. In females the start of spawning was earlier in older fish, but the end of spawning did not differ between age groups. In males spawning ended later in older fish. The time that mature plaice were in spawning condition increased with the age of the fish in males and females. During the spawning season mature plaice hardly fed. 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