Browsing by Author "Silva, Maria do Carmo"
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- WHY DO WE NEED HISTOLOGY OF HAKE (MERLUCCIUS MERLUCCIUS) GONADS? THE PORTUGUESE CASEPublication . Costa, Ana Maria; Silva, Maria do Carmo; Instituto Português do Mar e da AtmosferaWith a monthly sampling frequency between 2010 and 2013, 4238 fish were collected and their gonads were macroscopically and microscopically staged. The percentages of error encountered with the macroscopic assignments were analysed by sex, length class and month, both for all stages together and for stage 1 separately, where the highest percentages of error are found on the identification of the immature stages that in fact were already mature. When considering all the individuals the highest errors occurred in the females (11%), in the length classes of 28 and 40 cm (26% and 25%, respectively) and in June (17%). The greatest misidentifications of maturity stage 1 were verified in males in length classes under 32 cm (92%) and over 57 cm (100%) and in the months of June, July and October (100%). The L50 decreased 8.1 cm (from 34.4 to 26.3 cm) with the microscopic identification, considering combined sexes and 2.3 cm (from 40.6 to 38.3 cm) only in females.