The annual reproductive cycle and sex inversion of the Picnic seabream,Acanthopagrus berda(Forsskål 1775) from Indian waters: Histological and morphometric description
| Autor: | Paramita Banerjee Sawant, Asokan Pillaru Kandiyil, Chadha Narinder Kumar, Imelda Joseph, Suresh Babu Padinhate Purayil, Shilta Madathampady Thomas, Vinod Kavungal, Ramya Abhijith |
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| Rok vydání: | 2019 |
| Předmět: |
Estrous cycle
0303 health sciences Gonad Zoology Histology Ovary Aquatic animal 04 agricultural and veterinary sciences Aquatic Science Biology Sperm 03 medical and health sciences medicine.anatomical_structure Acanthopagrus berda 040102 fisheries medicine 0401 agriculture forestry and fisheries Development of the gonads 030304 developmental biology |
| Zdroj: | Aquaculture Research. 50:2917-2931 |
| ISSN: | 1365-2109 1355-557X |
| Popis: | The annual reproductive cycle of picnic seabream, Acanthopagrus berda (Forsskal, 1775), one of the potential aquaculture candidate from estuarine waters of Calicut, Kerala (India) was studied. Based on the morphological and histological studies, the ovotestes of A. berda were classified as active male, active female, inactive male, inactive female, transitional and undifferentiated. Histological observation of transitional gonads showed signs of degeneration in the testicular lobe, proliferation of connective tissue and empty sperm ducts indicating protandrous hermaphroditism in A. berda. Ovary was classified into seven maturity stages (virgin, developing virgin, developing, maturing, mature, running, spent) and testis into five maturity stages (resting, maturing, mature, running, spent). Gonadal development in A. berda indicated resting phase (February–July), pre‐spawning phase (March–August) and spawning phase (August–December). Inactive (24.6%) and active males (21.6%) were observed as dominant in smaller length classes (140–250 mm TL), whereas inactive (18%) and active females (51%) were observed as dominant in larger length classes (251–450 mm TL). Few primary females (28.1%) were observed in smaller (below 250 mm TL) and few primary males (28.5%) were observed in larger length classes (above 250 mm TL). From the present study, it can be concluded that in A. berda, most of the individuals function first as males and then change sex to female, but few continue to function as either male or female throughout their lifespan indicating digynous protandrous hermaphroditism. |
| Databáze: | OpenAIRE |
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