scholarly journals Rediscovering hermaphroditism in Grammatidae with the description of the testicular gland in Brazilian Basslet Gramma brasiliensis

2016 ◽  
Vol 76 (3) ◽  
pp. 743-749 ◽  
Author(s):  
J. R. Leite ◽  
M. O. Freitas ◽  
E. G. Sanches ◽  
M. L. M. Gomes ◽  
M. Hostim-Silva ◽  
...  

Abstract Many aspects of sex change in reef fishes have been studied, including behavior and social organization. However, gonad histology remains the most robust way to identify sexual patterns in fishes. Some uncommon tissues remain poorly described, such as the accessory gonadal structures found in species from the Gobiidae family, which are rare in other bony fishes. This is the first report of the testicular gland in Gramma brasiliensis and for the Grammatidae family. Between April 2011 and February 2012 eighty specimens were collected during four dive campaigns on the Taipus de Fora reef (13°56’20”S 38°55’32”W), Bahia, Northeast Brazil, and their sex was determined. Thirteen per cent of the active-females and 90% of the active-males had testicular gland tissue in their ovotestis. This discovery led to additional research into the characteristics of the gland tissue and its relationship with gonadal maturation. Three patterns of testicular gland development were found in Brazilian basslet ovotestis. Both ova and sperm-producing gonad contained testicular gland tissue, and the appearance of this tissue seems to be the first modification of ovotestis tissue marking the beginning of the protogynous sex-change process in G. brasiliensis.

2020 ◽  
Vol 30 (3) ◽  
Author(s):  
E. E. Easter ◽  
M. S. Adreani ◽  
S. L. Hamilton ◽  
M. A. Steele ◽  
S. Pang ◽  
...  

2006 ◽  
Vol 25 (2) ◽  
pp. 133-137 ◽  
Author(s):  
Hisaya Manabe ◽  
Mami Ishimura ◽  
Akihiko Shinomiya ◽  
Tomoki Sunobe

2008 ◽  
Vol 5 (1) ◽  
pp. 73-76 ◽  
Author(s):  
Stefan P.W Walker ◽  
Mark I McCormick

Many reef fishes change sex during their life. The testing of life-history theory and effective fisheries management therefore relies on our ability to detect when this fundamental transition occurs. This study experimentally illustrates the potential to glean such information from the otolithic bodies of the inner-ear apparatus in the sex-changing fish Parapercis cylindrica . It will now be possible to reconstruct the complete, often complex life history of hermaphroditic individuals from hatching through to terminal reproductive status. The validation of sex-change associated otolith growth also illustrates the potential for sex-specific sensory displacement. It is possible that sex-changing fishes alter otolith composition, and thus sensory-range specificity, to optimize life history in accordance with their new reproductive mode.


1994 ◽  
Vol 187 (1) ◽  
pp. 99-111 ◽  
Author(s):  
H. J. Brook ◽  
T. A. Rawlings ◽  
R. W. Davies

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