On the use of the gonosomatic index

Allometric growth and sperm competition in fishes

“…Thus, simple comparisons of I G among individuals within species ( e.g . between parasitic and bourgeois males) may not accurately reflect investment into gonads and sperm production (DeVlaming et al ., 1982).…”

Allometric growth and sperm competition in fishes

“…Thus, simple comparisons of I G among individuals within species ( e.g . between parasitic and bourgeois males) may not accurately reflect investment into gonads and sperm production (DeVlaming et al ., 1982).…”

Population dynamics and reproductive biology of Barilius bendelisis (Cyprinidae: Cypriniformes) from river Gaula of Central Indian Himalaya

“…When fish spawns, there is a decrease in the weight of the gonad because of the release of gametes (De Vlaming, Grossman, & Chapman, 1982). The changes in the magnitude of GSI in the present study revealed that the Barilius bendelisis spawns twice in a year during March to May, and in the month of September, which is similar as reported by Dobriyal & Singh (1987).…”

The use of the urogenital papillae of male feral African sharptooth catfish (Clarias gariepinus) as indicator of exposure to estrogenic chemicals in two polluted dams in an urban nature reserve, Gauteng, South Africa

“…Calculating the GSI is also often used to assess gonadal changes in response to environmental conditions or contaminant exposure. There is significant evidence that exposure to exogenous contaminants can lead to gonadal alterations such as morphological changes and/or decreased GSI (De Vlaming et al, 1981). The GSI values for males determined in this study were similar to those reported by Barnhoorn et al (2004), where the GSI values for intersex catfish collected were in a closer range to the male GSI values than to females.…”

Allometric growth and sperm competition in fishes

“…Thus, simple comparisons of I G among individuals within species ( e.g . between parasitic and bourgeois males) may not accurately reflect investment into gonads and sperm production (DeVlaming et al ., 1982).…”

Population dynamics and reproductive biology of Barilius bendelisis (Cyprinidae: Cypriniformes) from river Gaula of Central Indian Himalaya

“…When fish spawns, there is a decrease in the weight of the gonad because of the release of gametes (De Vlaming, Grossman, & Chapman, 1982). The changes in the magnitude of GSI in the present study revealed that the Barilius bendelisis spawns twice in a year during March to May, and in the month of September, which is similar as reported by Dobriyal & Singh (1987).…”

The use of the urogenital papillae of male feral African sharptooth catfish (Clarias gariepinus) as indicator of exposure to estrogenic chemicals in two polluted dams in an urban nature reserve, Gauteng, South Africa

“…Calculating the GSI is also often used to assess gonadal changes in response to environmental conditions or contaminant exposure. There is significant evidence that exposure to exogenous contaminants can lead to gonadal alterations such as morphological changes and/or decreased GSI (De Vlaming et al, 1981). The GSI values for males determined in this study were similar to those reported by Barnhoorn et al (2004), where the GSI values for intersex catfish collected were in a closer range to the male GSI values than to females.…”

Allometric growth and sperm competition in fishes

“…Thus, simple comparisons of I G among individuals within species ( e.g . between parasitic and bourgeois males) may not accurately reflect investment into gonads and sperm production (DeVlaming et al ., 1982).…”

Population dynamics and reproductive biology of Barilius bendelisis (Cyprinidae: Cypriniformes) from river Gaula of Central Indian Himalaya

“…When fish spawns, there is a decrease in the weight of the gonad because of the release of gametes (De Vlaming, Grossman, & Chapman, 1982). The changes in the magnitude of GSI in the present study revealed that the Barilius bendelisis spawns twice in a year during March to May, and in the month of September, which is similar as reported by Dobriyal & Singh (1987).…”

The use of the urogenital papillae of male feral African sharptooth catfish (Clarias gariepinus) as indicator of exposure to estrogenic chemicals in two polluted dams in an urban nature reserve, Gauteng, South Africa

“…Calculating the GSI is also often used to assess gonadal changes in response to environmental conditions or contaminant exposure. There is significant evidence that exposure to exogenous contaminants can lead to gonadal alterations such as morphological changes and/or decreased GSI (De Vlaming et al, 1981). The GSI values for males determined in this study were similar to those reported by Barnhoorn et al (2004), where the GSI values for intersex catfish collected were in a closer range to the male GSI values than to females.…”