In females (Fig. 5a), the growth of oocytes (stage II)
occurred during October and January. The prematuration
(stage III) occurred almost simultaneously in all the population and extended until March at which point a long
period of maturation commenced (stage IV), and this
extended until September, involving almost all females
between March and July. Between April and September
individuals were observed to have partially spawned
(stage V) and between late summer and early autumn
specimens with empty gonads predominated (stage VI).
The recovery phase (stage I) seemed to be ephemeral
and, accordingly, at any one time few individuals were
observed in this stage. Males (Fig. 5b), like the females,
went through a period of growth between October and
January, an almost simultaneous prematuration phase and
a long maturity period (stage IV) which spread from December to September, with individuals who had released
some of their sperm appearing from April onwards (stage
V). Empty gonads (stage VI) were observed in October
and the recovery stage (stage I) was almost undetectable.
A high degree of overlap in the timing of the different
phases was observed between the sexes with a predominance of stage IV, indicating the occurrence of gonads in
maturation much of the year, with the exception of the
autumn, and a very clear breeding period between April
and September, that appears gradually but comes to an
end sharply in October, a month in which a large percentage of the population was found to have empty gonads.
In females (Fig. 5a), the growth of oocytes (stage II)
occurred during October and January. The prematuration
(stage III) occurred almost simultaneously in all the population and extended until March at which point a long
period of maturation commenced (stage IV), and this
extended until September, involving almost all females
between March and July. Between April and September
individuals were observed to have partially spawned
(stage V) and between late summer and early autumn
specimens with empty gonads predominated (stage VI).
The recovery phase (stage I) seemed to be ephemeral
and, accordingly, at any one time few individuals were
observed in this stage. Males (Fig. 5b), like the females,
went through a period of growth between October and
January, an almost simultaneous prematuration phase and
a long maturity period (stage IV) which spread from December to September, with individuals who had released
some of their sperm appearing from April onwards (stage
V). Empty gonads (stage VI) were observed in October
and the recovery stage (stage I) was almost undetectable.
A high degree of overlap in the timing of the different
phases was observed between the sexes with a predominance of stage IV, indicating the occurrence of gonads in
maturation much of the year, with the exception of the
autumn, and a very clear breeding period between April
and September, that appears gradually but comes to an
end sharply in October, a month in which a large percentage of the population was found to have empty gonads.
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