When stunning is not done properly or exsanguinations has not progressed enough , a significant proportion of animals are burnt before going unconscious. They point out that the slaughter of fish has received little attention. Fish die by asphyxia when they are taken out of the water , or when they are ground up in vacuum fishing . If they have been caught in nets, they may be exhausted from the attempts to free themselves. Sometimes fish are gutted while their hearts are still beating , and the beating is prolonged when they are put into ice.
Fish feel pain, and suffer stress in the nets and during asphyxia.
Sometimes fish is thrown back after withdrawing the hooks, fish may then die of the inability to eat, or microbial or fungal infections. A quatic and plant life are destroyed by acid rain that result from ammonia in animal waste and agricultural fertilisers. Livestock farming uses limited resources inefficiently . Millions of people suffer from hunger and thirst in the developing world while grain and water are used on rearing animals to be slaughtered for food in the developed world. Millions of hectares of life sustaining rain forest are destroyed each year to create grazing pasture putting at risk animal species and indigenous human populations.