scholarly journals The effect of DBS on survival of juvenile perch (Perca fluviatilis L.) in relation to certain physical factors

1979 ◽  
Vol 09 (2) ◽  
pp. 55-61
Author(s):  
Marek K. Jurkowski
Keyword(s):  
Perca Fluviatilis ◽  
Physical Factors ◽  
Perch Perca Fluviatilis

The Swimbladder and the Vertical Movement of Teleostean Fishes

1951 ◽  
Vol 28 (4) ◽  
pp. 553-566
Author(s):  
F. R. HARDEN JONES
Keyword(s):  
Body Wall ◽  
Bladder Wall ◽  
Relative Size ◽  
Perca Fluviatilis ◽  
Vertical Movement ◽  
Physical Factors ◽  
Vertical Movements ◽  
Perch Perca Fluviatilis ◽  
Percentage Volume ◽  
Two Factors

The vertical movements of a teleostean fish may be restricted by the presence of the swimbladder, which will increase or decrease in volume when the fish moves up or down in the water. It is shown that the restriction that the swimbladder imposes to vertical movements involving a reduction in pressure will depend on physical factors such as (1) The resistance that the bladder and body wall offer to the expansion of the bladder gas. (2) The percentage volume of the swimbladder and the density change of the fish when it is subjected to a reduction in pressure. (3) The pressure reduction that leads to the rupture of the bladder wall. A distinction is made between rapid and slow movements. In the former the compensatory ability of the fish must be considered and in the latter the speed with which the fish can accommodate itself to pressure changes. An equation is derived from which the minimum speed at which a physoclist can migrate from deep to shallow water can be calculated. To solve the equation two factors must be determined experimentally. Various experiments are described which were made on the perch, Perca fluviatilis, the wrasse, Crenilabrus melops, the rockling, Onos mustela and the dragonet, Callionymus lyra. The results showed that there was a relation between the relative size of the swimbladder and the change in the density of a fish when it is subjected to a reduction in pressure; that the bladder and body wall of the perch offer little resistance to the expansion of the bladder gas; and that the danger of the bladder wall rupturing might restrict the extent of rapid movements made by the perch. Experiments on the restriction that the swimbladder imposes to the rapid and slow vertical movements of the perch will be described in a following paper.

Consumption of plant material by perch (Perca fluviatilis)

2016 ◽  
Vol 65 (2) ◽  
pp. 95-97 ◽  
Author(s):  
Tomáš Zapletal ◽  
Zdeněk Adámek ◽  
Pavel Jurajda ◽  
Kevin Roche ◽  
Lucie Všetičková ◽  
...  
Keyword(s):  
Plant Material ◽  
Perca Fluviatilis ◽  
Perch Perca Fluviatilis

Short-term storage of perch (Perca fluviatilis L.) milt under cooling conditions

2013 ◽  
Vol 13 ◽  
pp. 39 ◽  
Author(s):  
Beata Sarosiek ◽  
Beata I. Cejko ◽  
Dariusz Kucharczyk ◽  
Daniel Żarski ◽  
Sylwia Judycka ◽  
...  
Keyword(s):  
Perca Fluviatilis ◽  
Short Term ◽  
Cooling Conditions ◽  
Perch Perca Fluviatilis ◽  
Short Term Storage ◽  
Term Storage

Oocyte quality indicators in Eurasian perch, Perca fluviatilis L., during reproduction under controlled conditions

Aquaculture ◽  
2011 ◽  
Vol 313 (1-4) ◽  
pp. 84-91 ◽  
Author(s):  
Daniel Żarski ◽  
Katarzyna Palińska ◽  
Katarzyna Targońska ◽  
Zoltán Bokor ◽  
László Kotrik ◽  
...  
Keyword(s):  
Quality Indicators ◽  
Perca Fluviatilis ◽  
Oocyte Quality ◽  
Eurasian Perch ◽  
Controlled Conditions ◽  
Perch Perca Fluviatilis
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