|Age, growth and reproduction of the black goby, Gobius niger, from Óbidos Lagoon, Portugal|
Silva, M.N.; Gordo, L.S. (1997). Age, growth and reproduction of the black goby, Gobius niger, from Óbidos Lagoon, Portugal. Cah. Biol. Mar. 38(3): 175-180
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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Black gobies (Gobius niger) were sampled monthly between November 1992 and December 1994 using a beach seine net. Length distribution varied between 3.5 and 15 cm total length. Age determined from direct reading on 671 female and 750 male otoliths was comprised from less than one year to three years. There were no significant differences in mean lengths at age group for the two sexes, which allowed the use of combined data. A von Bertalanffy growth equation, based on the data of all individuals, was established: L sub(t)= 16.657[1 - e super(-0.337 (t + 1.910)1)]. The spawning season occurred between March and September. In this population, the sex ratio was 1. 1: 1. However, during the spawning season, the females were in majority in the samples (53.2%) while, in the resting period, males were present in 71.7 % of the catches.