. "Hul\u00E1k, Martin" . . . "Studies on annual gonadal development and gonadal ultrastructure i spiny-cheek crayfish (Orconectes limosus)" . "BFPP-connaissance et gestion du patrimoine aquatique" . "4"^^ . "Koz\u00E1k, Pavel" . "3"^^ . . . "[44E124FE5075]" . "FR - Francouzsk\u00E1 republika" . . . . "12520" . . . . "gonadosomatic index; Orconectes limosus; ovary; testis; vas deferens; intersex"@en . . . . "The aim of this study was to follow the gonadal development in freshwater crayfish Orconectes limosus (Rafinesque) by histological examination of ovaries and testes as well as monthly investigation of the gonadosomatic index over a period of one year. Male gonadosomatic index (I-G) ranged between 0.11 to 0.79% with a minimum in July (0.11 %) and maximum in September (0.79%) while in females it ranged between 0.25 to 6.15% with a minimum in July (0.25%) and maximum in April (6.15%). Between April and May, the histological dissection indicated presence of mature oocytes and oocytes undergoing resorption. Egg extrusion took place in mid April. During the summer months, the volume of oocytes gradually decreased. In winter and spring, the volume of oocytes began to increase during preparation for egg extrusion. The size of oocytes in the ovary increased from 0.2 mm at the beginning of the reproductive cycle to 1.8 mm immediately before egg extrusion. Average number of eggs in the ovary was 140.8 +/- 51.63" . "384" . "12"^^ . "1" . . . "Studies on annual gonadal development and gonadal ultrastructure i spiny-cheek crayfish (Orconectes limosus)"@en . "RIV/60076658:12520/07:00007822" . "Tich\u00FD, F." . "1297-6318" . "The aim of this study was to follow the gonadal development in freshwater crayfish Orconectes limosus (Rafinesque) by histological examination of ovaries and testes as well as monthly investigation of the gonadosomatic index over a period of one year. Male gonadosomatic index (I-G) ranged between 0.11 to 0.79% with a minimum in July (0.11 %) and maximum in September (0.79%) while in females it ranged between 0.25 to 6.15% with a minimum in July (0.25%) and maximum in April (6.15%). Between April and May, the histological dissection indicated presence of mature oocytes and oocytes undergoing resorption. Egg extrusion took place in mid April. During the summer months, the volume of oocytes gradually decreased. In winter and spring, the volume of oocytes began to increase during preparation for egg extrusion. The size of oocytes in the ovary increased from 0.2 mm at the beginning of the reproductive cycle to 1.8 mm immediately before egg extrusion. Average number of eggs in the ovary was 140.8 +/- 51.63"@en . . . . "Studies on annual gonadal development and gonadal ultrastructure i spiny-cheek crayfish (Orconectes limosus)"@en . . "453106" . . . . "000249492000002" . "Policar, Tom\u00E1\u0161" . "P(GP206/03/D064), P(ME 855), Z(MSM6007665809)" . "RIV/60076658:12520/07:00007822!RIV10-MSM-12520___" . "Studies on annual gonadal development and gonadal ultrastructure i spiny-cheek crayfish (Orconectes limosus)" .