Histological changes in ovaries and testis of migratory species was observed throughout the year. The gonadal development stages were clearly identified with characteristics. On the basis of the gonadal development stages , want to estimate the length at first maturity(L50) of this fish.
But now the question i never fully solved, what is sexual maturity , when the fish attain the sexual maturity first time and how to determine it with precision.
Please have a look at this researchgate link also.
https://www.researchgate.net/post/What_is_the_physiological_definition_of_sexual_maturity_in_fish/1
Please check this useful link also.
https://www.researchgate.net/post/Are_there_simple_and_non-invasive_tests_for_the_maturity_status_of_fish/1
Kindly check..
https://www.researchgate.net/post/What_is_the_physiological_definition_of_sexual_maturity_in_fish
See also..
http://www.fishbase.org/manual/fishbasethe_maturity_table.htm
Check here too..
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000400014
Please see through this also..
http://www.tandfonline.com/doi/full/10.1080/19425120.2011.555724
Sexual maturity is the age or stage when an organism can reproduce. It is sometimes considered synonymous with adulthood. In humans, the process of sexually maturation is termed puberty. ... It may also be accompanied by a growth spurt or other physical changes which distinguish the immature organism from its adult form.sexual maturation" to describe the physiological process from puberty to spawning. This is a complex, continuous process, including e.g. endogenous and exogenous vitellogenesis in females, and by looking at gonadal development, one can define stages of sexual maturation.
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwjBmeuPy8LTAhXLqo8KHWqtA3gQFghGMAU&url=http%3A%2F%2Fwww.nature.com%2Farticles%2Fsrep07205&usg=AFQjCNEJQRgyB-1rdqPtfS2BhoNXwccy-g&sig2=EDFmgpzDDVU20pp3sEH8Ag
This link of article is maybe useful
Article Sexual maturation and reproductive zinc physiology in the fe...
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