Environmental correlate of the testicular events in a major carpCatla catlain an annual reproductive cycle

Abstract

Current communication describes annual testicular events in free-living

Role of photoperiod and melatonin in the regulation of ovarian functions in Indian carp Catla catla: basic information for future application

“…2. A recent study on the testicular features in C. catla also indicated the occurrence of identical reproductive phases in the annual cycle (Bhattacharyya and Maitra 2006). This classification follows the pattern described for annual gonadal cycles in other Indian teleosts (Garg and Jain 1985;Mukherjee et al 1989;Srivastava and Singh 1991).…”

DIETARY SUPPLEMENTATION OF VITAMIN C, L-ASCORBATE 2-TRIPHOSPHATE CALCIUM (LATP-Ca) ON OOCYTE DEVELOPMENT OF MAJOR CARP ROHU (LABEO ROHITA) REARED IN A NATURAL CONCRETE POND

“…1, 2 and 3 that ovaries present in the fish of without treated with vitamin C were small in size while the size of ovary was comparatively larger in their weight and length. This has been shown for many fish like major carps (Sen et al 2002, Day et al 2004, Bhattacharyya and Maitra 2006. It is known that major carps spawn during the monsoon season when rainfall is at maximum of the year and a casual relation existed between these parameters as was reported by earlier workers (Jhingran 1986, Jhingran and Pullin 1985, Pillay and Kutty 2005.…”

Annually twice induced spawnings provide multiple benefits: Experimental evidence from an Indian major carp ( Catla catla , Hamilton 1822)

“…In fish, the neuroendocrine regulation stimulates testis maturation and milt production, which can be varied based on seasons (Assem et al, 2016;Trudeau, 1997). The variations in the duration of solar photoperiod, rainfall and some other environmental factors between spawning seasons can also make the significant differences in testis maturation and milt production (Bhattacharyya & Maitra, 2006;Mananõs, Duncan, & Mylonas, 2008). For instance, solar photoperiod can regulate the secretion of melatonin and other reproductive hormones to enhance the maturation of testes and overall milt production in carps and other fish species (Aripin, Jintasataporn, & Yoonpundh, 2015;Maitra & Hasan, 2016).…”

“…Catla catla, locally known as 'catla', is the second most important commercial freshwater fish species in the Indian subcontinent after Labeo rohita (FAO, 2009;Shamsuzzaman et al, 2017). Like other species of Indian major carps, they spawn in groups once a year in nature, while they are now artificially induced in commercial hatcheries to spawn twice annually, such as first spawn in June-July and second time in August-September (Bhattacharyya & Maitra, 2006;Chattopadhyay, 2017). These multiple spawnings provide the great opportunity to the hatcheries to produce the required amount of seeds.…”