Objectives for Chapter 7:
Sampling the Biota.
After reading the chapter and attending the lectures, you should be
- give a variety of reasons why a biologist may need
to capture an animal.
- define stress and discuss how capture
techniques can cause stress on animals. How can this stress be avoided?
- describe in detail the types of permits required
to use in PA waters the seines, fyke nets, and electrofishing equipment
discussed in lecture. Who gives out these permits?
- explain the following statement: “All sampling
devices are in some way selective or biased.”
- be able to discuss the structure and mechanics of
using passive entanglement devices such as gill nets,
trammel nets, etc.
- select, given specific criteria, the appropriate
sampling technique to use to achieve your objective.
- describe techniques or modifications intended to
minimize bycatch of non-target species.
- distinguish between active and passive
- describe the structure and use of a bag
seine and a purse seine.
- distinguish between a beam and otter
trawl; how do these differ from dredges?
- explain the use of piscicides for
- compare the chemistry, action, and methodry of
using rotenone and antimycin.
- discuss the specific use of TFM and
Bayer 73 as lampricides; include a discussion of the natural
history of the Sea Lamprey in the Great Lakes.
- discuss the relative pro’s and con’s of all the
above mentioned fish capture techniques.
- discuss the technique of electrofishing,
including the safety precautions that must be taken.
- distinguish between AC, DC, and pulsed DC currents
- answer the Practice Questions at the end of the
Sample (as a noun)
Experimental gill net