Lefler, 2008



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Blicca bjoerkna Female Maximum GSI value Ovary weight gradually increases during the spring months and peaks at the beginning of May (15.56%) 15.56 percent
Barbus barbus Female Maximum GSI value GSI reaches its maximim value at the beginning of May (11.00%) 11.0 percent
Chondrostoma nasus Female Maximum GSI value GSI = 20.63% in April 11 (n = 12) 20.63 percent
Leuciscus idus Female Maximum GSI value GSI =18.57 % in March 29 (n=5) 18.57 percent
Blicca bjoerkna Female Resting period The ovary of the white bream enters a period of tranquillity between November and March No data
Barbus barbus Female Resting period Following early spring spawning oocytes in the stage of primary growth are in majority in the ovary. Mitotically dividing oogonia, non-ovulated oocytes and eggs that were not released during spawning are also present in the ovaries. The latter two groups of cells undergo the process of resorption. Continuous atresia is also in process in the ovary that affects primarily the least developed functioning oocytes during the post-spawning period, i.e., those in the stage of primary growth. In all probability their number will further decrease immediatly after the spawning season No data
Chondrostoma nasus Female Resting period Following early spring spawning oocytes in the stage of primary growth are in majority in the ovary. Mitotically dividing oogonia, non-ovulated oocytes and eggs that were not released during spawning are also present in the ovaries. The latter two groups of cells undergo the process of resorption. Continuous atresia is also in process in the ovary that affects primarily the least developed functioning oocytes during the post-spawning period, i.e., those in the stage of primary growth. In all probability their number will further decrease immediatly after the spawning season No data
Blicca bjoerkna Female Onset of oogenesis The intensity of ovogenesis began to increase in August and September. […] Based on our investigations the GSI value is about 4.5% at the end of September, which can clearly be explained by oocytes entering the stage of cortical alveoli ['August', 'September']
Barbus barbus Female Onset of oogenesis Data collected in the orfe and nase show that the transition of oocytes in the stage of primary growth into the stage of cortical alveoli takes place in July-August and vitellogenesis already starts in August-September. Thus the formation of cortical alveoli is intensive in the second half of summer and is terminated at the end of October. Vitellogenesis starts at the end of summer and lasts until the beginning of spawning season ['October', 'August', 'July', 'September']
Chondrostoma nasus Female Onset of oogenesis Data collected in the orfe and nase show that the transition of oocytes in the stage of primary growth into the stage of cortical alveoli takes place in July-August and vitellogenesis already starts in August-September. Thus the formation of cortical alveoli is intensive in the second half of summer and is terminated at the end of October. Vitellogenesis starts at the end of summer and lasts until the beginning of spawning season ['October', 'August', 'July', 'September']
Leuciscus idus Female Onset of oogenesis Data collected in the orfe and nase show that the transition of oocytes in the stage of primary growth into the stage of cortical alveoli takes place in July-August and vitellogenesis already starts in August-September ['August', 'July', 'September']
Blicca bjoerkna Female Intensifying oogenesis activity The long period of tranquillity is followed in early spring by a rapid gain in ovary weight which is a result of increasing day length, temperature, and improving food supply. By April, the intensity of ovogenesis in the ovaries increased again. The GSI value increased one and a half times in a short period of time (from 5.67% to 8.67%) [...] Thus, in the one - one and a half months prior to spawning vert intensive qualitative and quatitative processes can be observed in the ovary. This is the most intensive period of the ovarian cycle which is shown by quantifiable reproductive indicators. ['April', 'May', 'June']
Barbus barbus Female Intensifying oogenesis activity As vitellogenesis in the barvel does not stop in winter months, the number of oocytes in the stage of vitellogenesis in samples collected in December alsmot reaches that of cells in the stage of cortical alveoli ['February', 'March', 'January', 'December']
Blicca bjoerkna Spawning conditions Spawning release Multiple spawners Mutliple
Barbus barbus Spawning conditions Spawning release Multiple spawners Mutliple
Chondrostoma nasus Spawning conditions Spawning release Single spawner Total
Leuciscus idus Spawning conditions Spawning release Single spawner Total