Your work is very interesting. I'm working in Galician hake since 2002 and I have always curiosity to know what was happening in Portugal. What I have observed in Galician hake is that there are 3 peaks of spawning: the main one between Jan-Mar, the second one between May-Jul and the third one between Sep-Oct. But these peaks may change between years, I mean, the winter peak can be in Jan in one year, but in Feb or March in the next one. I think this variability is an adatation to optimal environmental windows. You have pooled all years together and detect four peaks of spawning activity, but they can be an artifact because peaks of different years could be overlapped. I suggest you to analyze monthly variation of spawning fraction (that is the most adequate index of spawning activity) year by year. I would be pleased to discuss with you about regional differences in this amazing specie. All my best
Article Somatic Condition, Growth and Reproduction of Hake, Merlucci...
I am analyzing the monthly variation in GSI of scad, threadfin porgy and indian mackerel in the gulf of Tonkin of Vietnam. Results also showed the change of GSI year to year one month later. I am searching for acceptable explaination for these findings. Can anyone discuss more about that?
In our case interanual variations in the reproductive activity patern is related to upwelling events that may change between years. In other species, spawning season beginning and duration may be related to female experience, condition, or even size, but usually it is always associated to its capacity of reproducing in certain environmental conditions.
Thank you very much for your interest.I will follow your suggestion and I will analyze the monthly variation of spawning fraction year by year. It is very good to know that I can discuss these subjects with someone else because I am working alone with this species here in Portugal
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