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Fisheries

Use of Hatchery Fish for Conservation, Restoration, and Enhancement of Fisheries

QuestionAnswer
Agriculture versus Aquaculture Agriculture Cultivation of the soil, producing crops, and raising livestock and in varying degrees which results in increased productivity Aquaculture Propagation of aquatic organisms that results in increased productivity compared to a natural setting
Aquaculture occurs through ___________ environment Controlled
High intensity aquaculture Large scale facility, cemented, staff
Semi intensive aquaculture Pond or impoundment lower involvement
Low intensity aquaculture Mainly citizens in poorer areas
What countries are known for aquaculture production China, India, Japan, Egypt, United States
What is propagation used for? Food, stocking,
Stocking purposes biological control, put and take fishery, enhancement of fishing, rehabilitation
When did hatcheries spring up? mid 1800s; Theodatus Garlick
What become AFS? 1870 American fish culturalists association
Who was the first commissioner of fish and fisheries? Spencer Baird
Goals of AFS? Not clear Examples: Examples: Maintain quality fishing Protect quality and diversity Maintain a healthy aquatic environment Meet the demand for angling Provide a diversity of fish species
Stocking problems Loss of innate behaviors, instinct “domesticated” Spawning times Socially aggressive Predator avoidance Inefficient foragers – less growth
Why be concerned with genetics in stocking fish? Avoid Inbreeding Inbreeding depression Loss of genetic diversity (heterozygosity, allelic richness) Avoid Genetic Drift Random loss of alleles due to change
Genetic considerations in stocking? Keep high effective pop size
Physiological considerations Swim bladder problem Prepared diets (changes foraging behaviors in fish)
Size considerations in stocking larger fish survive better Large individuals account for 50% of stocking
Disease considerations 1. Whirling disease in trout/salmon -Scoliosis -Axial skeletal deformities -Pigment abnormalities 2. Myxobolus cerebralis 3. Transferred to wild stocks
Why consider taxa? Desires and wants of the people Hybrids, natives, non-natives
How many to stock? GOALS AND OBJECTIVES
Problems with where to stock? truck following problem vs cost of spreading out stocking
Things to consider (location/time of stocking) Angler success rate, time efficiency, labor, stress
Stocking may be criticized by _________ And demanded by ______________ purists; anglers
Legitimate concerns of fisheries recreation, conservation, preservation
Created by: llamaandlearning
 



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