Biology 2483A Lecture 2: Lecture 2 & ch. 2

• School: Western University
• Department: Biology
• Course: Biology 2483A
• Professor: Hugh Henry

Document Summary

Salmon are born in fresh water streams, then swim out to the ocean, then complete their life cycle as adults by coming back to the fresh water stream and laying eggs again. A lot of then salmon we catch are in the ocean. Potential causes of salmon declines in the north pacific ocean: Dam construction (blocking the salmon from coming back to the steams) Sediment from logging operations: affecting the breeding habitat. Overharvesting of the salmon they tried to fix all these problems, and the salmon still were not rebounding . B/c the conditions of oceans, where salmon spend most time as adults, have also been implicated. Study found: fish harvest records and showed alternating periods of high and low production associated with climatic variation in the north pacific. Maybe its just a natural climate variation occurring, and this is not a real problem. Study found: periods of high salmon production in. Alaska corresponded with periods of low production in.