Objectives for Chapter 7:  Sampling the Biota.

After reading the chapter and attending the lectures, you should be able to

  1. give a variety of reasons why a biologist may need to capture an animal.
  2. define stress and discuss how capture techniques can cause stress on animals.  How can this stress be avoided?
  3. 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?
  4. explain the following statement:  “All sampling devices are in some way selective or biased.”
  5. be able to discuss the structure and mechanics of using passive entanglement devices such as gill nets, trammel nets, etc.
  6. select, given specific criteria, the appropriate sampling technique to use to achieve your objective.
  7. describe techniques or modifications intended to minimize bycatch of non-target species.
  8. distinguish between active and passive capture devices.
  9. describe the structure and use of a bag seine and a purse seine.
  10. distinguish between a beam and otter trawl; how do these differ from dredges?
  11. explain the use of piscicides for collecting fishes.
  12. compare the chemistry, action, and methodry of using rotenone and antimycin.
  13. 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.
  14. discuss the relative pro’s and con’s of all the above mentioned fish capture techniques.
  15. discuss the technique of electrofishing, including the safety precautions that must be taken.
  16. distinguish between AC, DC, and pulsed DC currents in electrofishing.
  17. answer the Practice Questions at the end of the chapter.


Sample (as a noun)


Experimental gill net

Potassium permanganate

Duty cycle