Imprinting of White Fish (Rutilus frisii kutum) with Morpholine

During last two decades 200 millions of kutum fingerlings were released into the Caspian Sea Rivers annually. Morpholine as retrieving agent were used by many researchers for homing of fishes. To understand the effects of morpholine on fisheries return of kutum fishes a project with use of tagging method was approved in2004 and its first phase started in 2005. Brooders were selected from Khoshkrud River and breeding were done in shahid ansari hatchery, Rasht. Totally 15930 fishes were subjected for this study. 5480 fingerlings (4-5g.) were used for determining the dose effects of morpholine (3 treatments 5x10*-2,5x10*-5 ,5x10*-7 mg/lit) in return rate and homing of fishes. Results revealed that there were significant differences between kutum return rate exposed with 5x10*-5 mg/lit (0.62 %) with other treatments i.e. : 5x10*-7 ، (0.15%) and 5x10*-2 (0.37%) during the experimented period(P<0.001). To determine the critical period for imprinting of morpholine 10450 kutum fishes were exposed to 5x10*-5 mg/lit of morpholine in different growth stages(yolk sac fry ,active fry, 2-3-g. fingerlings , 4-5 g. fingerling ).Results showed significant difference between kutum return rate in active fry stage(1 %) compare to other stages i.e. , yolk sac fry (0.23%) , 2-3- g. fingerling(0.23%) , 4-5 g. fingerling (0.26%) and control(0.13) during the tree years of experiment(P<0.001). There were significant difference in sex ratio [M(1.42): F(1)] in recaptured kutums in khoshkrud river( x2=6.4 α= 0.05 df= 1).Recapturing rate were 6.7 % compare to recapture rate during last 5 year(5%) revealed that morpholine can be use for return rate enhancing of kutum.

Bibliographic Details

Main Authors:	Hosseinzadeh Sahafi, Homayoun, Abdolhay, H., Khanipour, A., Shoaei, H., Tooloei, M., Khedmati, K., Sayadtar, J., Ramazani, M.R., Abbasi Ranjbar, K., Moosavi, M.A.
Format:	Report biblioteca
Language:	Persian
Published:	Iranian Fisheries Science Research Institute 2009
Subjects:	Kutum, Tagging, Return rate, Morpholine, Rutilus frisii kutum, Fingerlings, Imprinting,
Online Access:	http://hdl.handle.net/1834/14088
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