Dear fellow members of FISH-ECOL,
I am attempting to understand the effect of colonisation of British waters
by zander. These fish can affect the aquatic community directly through
predation, indirectly through alteration of foraging behaviour of prey and
also they can compete with other piscivores such as Northern Pike.
I have studied the diet of zander (Stizostedion lucioperca) and Northern
Pike (Esox lucius) in British Canals and am attempting to obtain
comparative information. I have found very few studies where the stomach
contents of this fish have been compared to the numbers and sizes of prey
found in the environment. Such information is useful in determining the
impact that these fish exert on aquatic communtities.
I am aware of the recent publication of the proceedings of PERCIS II
(ANNALES ZOOLOGICI FENNICI, 1996, Vol.33) and the enclosure work by
Greenberg et al.1995 (Oiks 4) and the general findings of PERCIS 1977 (J.
Fish. Res. Bd 34). There are a number of other descriptions of the stomach
contents of zander and pike, but without an idea of prey availability,
these offer a limited insight into feeding. I believe that this information
should exist somewhere because of the widespread use of zander and pike as
a tool in biomanipulation.
In summary I request information of studies on the feeding of zander (or
related Stizostedion species such as Walleye or Sauger) and pike that have
examined the size and species of prey consumed in relation piscivore
length. Any information can be sent to me directly and I will post a
summary in due course.
I am thanking you in advance
X Mr Phillip Smith X
X The Jones Building X
X School of Biological Sciences X
X University of Liverpool, PO Box 147 X
X Liverpool L69 3BX, UK X
X Phone: +44 (0)151 794 5292 X
X Fax: +44 (0)151 794 5289 X
X Internet:[log in to unmask] X