Age and growth of megrim, Lepidorhombus boscii, Risso of the portuguese continental coast

Castilho, Rita; Dinis, Maria Teresa; Erzini, Karim

http://hdl.handle.net/10400.1/4074

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Authors

Castilho, Rita

Dinis, Maria Teresa

Erzini, Karim

Abstract(s)

The first study of age and growth of four-spotted scaldfish, more commonly known as megrim (Lepidorhombus boscii, Risso), an important (by catch ) species of the Portuguese trawl fishery from the Atlantic coast is presented. The analysis was based on data obtained from a total of 609 specimens sampled between 1985 and 1986. Otoliths were used for age determination. The Von Bertalanf~, growth parameters were estimated using the non-linear fitting method: Lt (females)=440[ 1 -e -°-14(t+ 1.32) ] and Lt= 375 [ 1 -e -°~4(t+ 1.93) ] for males. L~ and to values are significantly different. The megrim grows allometrically (slope of length-weight regressions > 3 ). Females live longer and gain weight at a faster rate than males. Differences in growth between sexes become more apparent from the second year onwards.

Keywords

Lepidorhombus boscii Population genetics Conservation Demography

URI

http://hdl.handle.net/10400.1/4074

Citation

Castilho, Rita; Dinis, MT; Erzini, K. Age and growth of megrim, Lepidorhombus boscii, Risso of the portuguese continental coast, Fisheries research, 16, 339-346, 1993.