BIOL 1055 Lecture Notes - Lecture 17: Toxicant, Bottom Trawling, Atlantic Cod
Document Summary
Started in 1940s, new techniques in agricultural practices (plant breeding techniques, modern fertilizers, modern pesticides), significant increase in amount of food produced per acre, better irrigation. Norman borlaug: father of the green revolution, worked to keep food production growth in line with population growth (selective breeding, use of irrigation, synthetic fertilizer, pesticides in developing world) Atlantic cod: bottom-dwelling species, ~55-77 lbs, maximum age is 20 years but are usually caught at 2-5 years old, sexual maturity is at 2-4 years old, mostly located in. Important food source for native peoples and european settlers, first successful industry in colonial america. Mid-1800"s: harvesting using several methods, such as fish traps. 1880-1910: first signs of trouble as inshore stocks of cod become scarce. Early 1900"s: bottom trawling becomes harvest method of choice. 2003: newfoundland cod population declared endangered by canadian government. Effects of overfishing: affects size and age distribution, females spawning earlier, younger females produce smaller/fewer eggs, and smaller young fish.
