Study the Possibility of Collecting eggs through surgery of live females in the sturgeon fishes
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AbstractThis study was carried out on 16 Sturgeon spawner(6 ship and 10 persian sturgeon) which were operated in shahid Dr. beheshti Rearing and Propagation Complex during 2001, 2002 and 2003. surgery performed on 16 spawners (6 ship sturgeon and 10 persian sturgeon). operation fulfilled in 3 ways: 1- without anesthesia 2- anesthesia by injection of Chanazin 2%(4 to 10 mg for per kilogram of fish body weight) 3- anesthesia by replacing fish in clove powder solution. In the surgery operation without anesthesia, the fish maintained by three persons and the eggs removed. In the case of applying anesthesia, 2% Chanazin, with commercial name Rompun(20 mg/ml), 4- 10 mg for per kilogram of body weight injected, but the rate of clove Powder application was 150 200 mg/l.surgery carried out by Kosarva method(making slight cut on Ventral area stitching). The cut length was 6-8 cm. The cut site stitched by Kapron unabsorbable thread and single knot with 6 to 7 mm distance.The mean weight of female spawners of ship(Acipenser nudiventris) was 35.3 ± 8.3 kg(n=6) which 3.9 ± 0.89 kg caviar, removed on average(11% of total body weight). The mean weight of female spawners in Persian sturgeon(Acipenser persicus) was 23.6 ± 3.2 kg(n=10) that the mean rate of caviar removed was 2.7 ± 0.62 kg(11.4% of total body weight). Investigation on reared spawner of ship(Acipenser nudiventris, n=16) and Persian sturgeon (Acipenser persicus,n=60) without surgical operation showed that the average body weight of spawners was 43.7 ± 8.8 kg and 28.9 ± 6.4 kg and the mean rate of caviar removal was6.4 ± 1.7 kg (15.7% of total body weight) and 4.4 ± 1.3 kg (15.4% of total body weight) respectively. During 2001, surgical operation performed on 8 spawners(5 ship and 3 persian sturgeon) which one Persian sturgeon and 2 ship after one day, one ship after 3 days and two ship after 32 days and 105 days and 2 persian sturgeon after 91 and 136 days were died. During 2002, totally five Persian sturgeon were operated which all of them died after 46,116,130,132 and 157 days. During 2003, 3 spawners(2 persian sturgeon and one ship) were operated which two Persian sturgeon died after 23 and 59 days and one ship spawnerdied after 72 days. This mortality can be due to not feeding of formulated food and even live food by the wild spawners after surgery. Also, other factors can be mentioned, such as existence of otter in the ponds with spawners are kept, breaking of swim bladder during egg sampling in catch stations & hatcheries small area for maintaining spawners after surgery and not tolerating of surgical operation by some spawners. It should be mentioned that surgery point has been fully improved in the spawners that survived more than 40 days after surgery. The results of the study indicated that removal of caviar from wild spawners is possible, but maintaining them in freshwater to remove caviar again, can be problematic. So, the surgery for caviar removal & removing of caviar for second time in following years should be carried out only on reared spawners.
Publisher or UniversityIranian Fisheries Science Research Institute
Series : Nr84.725;