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Öğe Enzymatic, skeletal, and histological ontogeny of shi drum (Umbrina cirrosa) larvae under intensive culture conditions(Springer, 2023) Karacaoglan, Arif; Firat, Kuersat; Hekimoglu, Muege Aliye; Saka, Sahin; Suzer, Cueneyt; Midilli, Sema; Kirim, BirsenThis study was conducted to investigate the structural and ontogenetic development of the skeletal system and digestive tract histologically and enzymatically in larvae of shi drum (U. cirrosa) under intensive rearing conditions until 40 days after hatching (DAH). Among digestive enzymes, amylase was detected at 0.89 +/- 0.12 mU mg protein(-1) on the first hatching day. The specific activities of trypsin and lipase were detected simultaneously with mouth opening on 3 DAH with 28.47 +/- 3.52 and 2.8 +/- 0.32 mU mg protein(-1), respectively. In addition, pepsin was found for the first time at 0.88 +/- 0.21 mU mg protein(-1) on 15 DAH in association with stomach formation and increased sharply up to 40 DAH. In the structural development of the skeletal system, the development of the caudal fin in larvae was morphologically associated with the flexion of the notochord. It was observed that the shape of the fin and spine, which reached 40 DAH, became similar to the adult shape. Histologically, 3 DAH, the mouth and anus were opened. The formation of the primitive stomach was observed at the end of the seventh day-the pyloric sphincter formed between 13 and 18 days. A functional stomach was seen on the 15th DAH. Therefore, U. cirrosa is believed to have critical aquaculture potential that can be cultured under intensive conditions. The developmental profile of skeletal, enzymatic, and histological ontogeny observed in U. cirrosa is similar to that described for other sciaenid species.Öğe Enzymatic, skeletal, and histological ontogeny of shi drum (Umbrina cirrosa) larvae under intensive culture conditions (vol 49, 351, 2023)(Springer, 2023) Karacaoglan, Arif; Firat, Kursat; Hekimoglu, Muge Aliye; Saka, Sahin; Suzer, Cuneyt; Midilli, Sema; Kirim, Birsen[No abstract available]Öğe A study on oocyte development of the Atlantic bluefin tuna (Thunnus thynnus, Linnaeus 1758) under farming conditions(2019) Yıldırım, Şükrü; Midilli, Sema; Güler, Mehmet; Yurttaş, Rıdvan Cenk; Çoban, DenizBody length and weight measurements and histological samples were collected from slaughtered Atlantic bluefin tuna (Thunnus thynnus) that were fattening under farming conditions for the determination of oocyte development in February 2015 (n = 10), May 2015 (n = 1), June 2015 (n = 1), July 2015 (n = 9), and July 2016 (n = 3) during harvest and soon after newly dead. the developmental phases of oocytes were evaluated based on their diameters, fork body length and weight of fish, surface water temperature, and species’ reproduction season. According to the histological results, the oocytes were at the beginning of the regeneration and maturation phases in February; in the preovulation phase in May, advanced vitellogenic oocyte with yolk globules and atretic vitellogenic oocytes in June, and previtellogenic oocytes in July 2015. in July 2016, the oocytes were previtellogenic, vitellogenic, and advanced vitellogenic. Individuals were between 119 and 280 cm in fork length, weighed between 30 and 455 kg, and showed natural oocyte development at 16.7–22 °C surface water temperature under cage farming facility conditions during the species’ natural spawning season of May, June, and July.Öğe A study on oocyte development of the Atlantic bluefin tuna (Thunnus thynnus, Linnaeus 1758) under farming conditions(Scientific Technical Research Council Turkey-Tubitak, 2019) Yildirim, Sukru; Midilli, Sema; Guler, Mehmet; Yurttas, Ridvan Cenk; Coban, DenizBody length and weight measurements and histological samples were collected from slaughtered Atlantic bluefin tuna (Thunnus thynnus) that were fattening under farming conditions for the determination of oocyte development in February 2015 (n = 10), May 2015 (n = 1), June 2015 (n = 1), July 2015 (n = 9), and July 2016 (n = 3) during harvest and soon after newly dead. The developmental phases of oocytes were evaluated based on their diameters, fork body length and weight of fish, surface water temperature, and species' reproduction season. According to the histological results, the oocytes were at the beginning of the regeneration and maturation phases in February; in the preovulation phase in May, advanced vitellogenic oocyte with yolk globules and atretic vitellogenic oocytes in June, and previtellogenic oocytes in July 2015. In July 2016, the oocytes were previtellogenic, vitellogenic, and advanced vitellogenic. Individuals were between 119 and 280 cm in fork length, weighed between 30 and 455 kg, and showed natural oocyte development at 16.7-22 degrees C surface water temperature under cage farming facility conditions during the species' natural spawning season of May, June, and July.
