scholarly journals The effect of silver crucian carp (Carassius auratus gibelio Bloch) on the yields and the production value of common carp (Cyprius carpio) fingerlings

2006 ◽  
pp. 5-10
Author(s):  
Péter Bársony ◽  
László Pócsi ◽  
András Szabó
Keyword(s):  
Common Carp ◽  
Carassius Auratus ◽  
Crucian Carp ◽  
Stocking Rate ◽  
Silver Crucian Carp ◽  
Production Values ◽  
Production Value ◽  
The Common ◽  
Stocking Rates ◽  
Complex Question

During the last few years, the spread of the silver crucian carp has caused significant problems in pond fish culture. One of the main challenges of successful fish production in fishponds, is to rid ponds of the silver crucian carp. The nature of the damage caused by silver crucian carp is a complex question. To get into the ponds, the crucian carps occupy the territory before the common carp, and competes for food with common carp. The silver crucian carp has a less favorable food coefficient than the common carp, and it’s value is also lower. Therefore, the income of the fish farm decreases. In the course of the experiment, carp fry were stocked in 5 nursing ponds at the same stocking rate, with different (0,- 50-, 100-, 150-, 200%) stocking rates of silver crucian carp fry, respectively. At the end of the experiment, the yield/hectar and the production values were calculated. The experiment proved that the presence of the silver crucian carp in the fishponds causes lower yields and production values.

scholarly journals Study of the Interaction Between Common Carp (Cyprinus carpio L.) and Silver Crucian Carp (Carassius auratus gibelio B.)

2004 ◽  
pp. 16-19
Author(s):  
Péter Bársony ◽  
László Pócsi ◽  
András Szabó
Keyword(s):  
Common Carp ◽  
Growth Rates ◽  
Carassius Auratus ◽  
Crucian Carp ◽  
Average Weight ◽  
Silver Crucian Carp ◽  
Common Carp Cyprinus Carpio ◽  
Lower Productivity ◽  
The Common ◽  
Stocking Rates

During the last few years, the spread of the silver crucian carp caused significant problems in pond fish culture. One of the main challenges of the successful fish production in fishponds, is to rid ponds of the silver crucian carp. In the course of the experiment, carp fry were stocked in 5 nursing ponds at the same stocking rate, with different (0-, 50-, 100-, 150-, 200%) stocking rates of silver crucian carp fry, respectively. During the breeding season, weekly test fishings were made to examine the growth of the fishes. At the end of the experiment, the yield/hectar and the growth rates were calculated. The experiment proved that the presence of the silver crucian carp in the fishponds causes lower productivity and growth rates in common carp. In the control pond (with no silver crucian carp), the average weight of the common carp was over 20 g and the yield/hectar was over 700 kg, while in the pond with the most silver crucian carp, the average weight of the common carp was 4.5 g and the yield/hectar was only 123 kg.

scholarly journals Study of the Interaction Between Common Carp (Cyprinus carpio) and Silver Crucian Carp (Carassius auratus gibelio Bloch)

2005 ◽  
pp. 9-12
Author(s):  
Péter Bársony ◽  
László Pócsi ◽  
András Szabó
Keyword(s):  
Common Carp ◽  
Growth Rates ◽  
Crucian Carp ◽  
Fish Farming ◽  
Average Weight ◽  
Silver Crucian Carp ◽  
Lower Growth ◽  
Common Carp Cyprinus Carpio ◽  
The Common ◽  
Stocking Rates

Some of the main questions in the fish farming are the good manuring and the success of the feeding. For the best result is very important that only those fishes take place in the fishponds what we want. It seems to be easy but difficult to do. One of the main challenges of the successful fish production in fishponds, is to rid ponds of the silver crucian carp. In the course of the experiment, carp fry were stocked in 5 nursing ponds at the same stocking rate, with different (0-, 50-, 100-, 150-, 200%) stocking rates of silver crucian carp fry, respectively. During the rearing season, weekly test fishings were made to control the growth of the fishes. At the end of the experiment, the yield/hectar and the growth rates were calculated. The experiment proved that the presence of the silver crucian carp in the fishponds causes lower growth rates and productivity in common carp. In the control pond (without silver crucian carp), the average weight of the common carp was 25 g and the yield/hectar was over 900 kg, while in the pond with the most silver crucian carp, the average weight of the common carp was 9 g and the yield/hectar was only 158 kg.

Does Anoxia Induce Cell Swelling in Carp Brains? In Vivo MRI Measurements in Crucian Carp and Common Carp

2001 ◽  
Vol 85 (1) ◽  
pp. 125-133 ◽  
Author(s):  
Annemie Van der Linden ◽  
Marleen Verhoye ◽  
Göran E. Nilsson
Keyword(s):  
Common Carp ◽  
Crucian Carp ◽  
Free Water ◽  
Cell Swelling ◽  
Brain Swelling ◽  
Energy Deficiency ◽  
Water Homeostasis ◽  
The Common ◽  
Magnetic Resonance Imaging Mri

Although both common and crucian carp survived 2 h of anoxia at 18°C, the response of their brains to anoxia was quite different and indicative of the fact that the crucian carp is anoxia tolerant while the common carp is not. Using in vivo T2 and diffusion-weighted magnetic resonance imaging (MRI), we studied anoxia induced changes in brain volume, free water content (T2), and water homeostasis (water diffusion coefficient). The anoxic crucian carp showed no signs of brain swelling or changes in brain water homeostasis even after 24 h except for the optic lobes, where cellular edema was indicated. The entire common carp brain suffered from cellular edema, net water gain, and a volume increase (by 6.5%) that proceeded during 100 min normoxic recovery (by 10%). The common carp recovered from this insult, proving that the changes were reversible and suggesting that the oversized brain cavity allows brain swelling during energy deficiency without a resultant increase in intracranial pressure and global ischemia. It is tempting to suggest that this is a function of the large brain cavity seen in many ectothermic vertebrates.

Sign in / Sign up

Export Citation Format

Share Document