RNR 1001 Study Guide - Midterm Guide: Rangeland, Shortgrass Prairie, Supersaturation

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Published on 2 Jul 2014
School
LSU
Department
Renewable Natural Resources
Course
RNR 1001
Professor
Study Guide for Exam 3
Fisheries Conservation:
Dominant commercial fisheries groups: finfishes, crustaceans, and molluscs, kelp
Industrial fisheries - protein and oil
Stock - a unit of management
Stock fluctuations due to exploitation and environmental factors
- habitat loss and degradation have also played an important role
Fisheries and the Law of the Commons
Controlling fishing effort through limits on harvest, gear, crew size, area, season, etc.
Fisheries biota characteristics
- fatigue due to high density of water
- swimbladder problems because of the pressure/depth relationship
- stress from the temperature/dissolved oxygen relationship for poikilotherms
- turbidity problems, reduced primary production, invertebrate mortality, larval fish mortality, reduced
foraging by visual predators
- bioaccumulation and biomagnification problems because of movement of chemicals across thin gill
tissue
- indeterminate growth - fisheries advantage, continued growth through life, catch and release viable
- Type III survivorship, high fecundities, but high juvenile mortality
- complex trophic ontogeny requires consideration of food resources at all life history stages
- high population diversity because of reproductive isolation
- evolutionarily significant units, designation of critical habitat under the ESA
Invertebrates important as forage, bio-indicators (EPT taxa)
- complex life histories often result in high juvenile mortality
Important commercially harvested invertebrates - high economic value
Plants important as forage, habitat (macrophytes) and commercial fishery (kelp off California coast)
- can become a problem, particularly invasives
Stakeholder groups diverse, anyone with an interest in a fishery, includes existence value
Natural Resource Management System; resources, profit-seeking industries, management
bureaucracies, diverse publics
Recreational fisheries managed by state agencies (freshwater and marine to 3 miles), NOAA (3 miles to
200 miles, and straddling stocks between countries and state-federal boundary waters)
Louisiana Fisheries and Wildlife Commission
- political component of fisheries management
- sportfish issues with red drum in Louisiana
Federal Aid in Fish Restoration Act (1950) and Wallop-Breaux Act (1984)
- money for fisheries management from 10% tax on sportfishing gear, 18.5% motorboat fuels tax
- Aquatic Resources Trust Fund - $570 million split between Boating Safety and Sport Fish
Restoration accounts
- funds re-distributed to states on 75% federal:25% state cost share basis, based on license sales
and size of the state (5% maximum per state)
- coastal states must split equitably between fresh and salt water
- 12.5% on access mandatory, up to 15% on education, 18% to three wetlands programs
Fisheries management dependent on data
- biota: relative abundance and species composition of the fish assemblage, growth (annuli on hard
parts such as otoliths, spines, and scales), mortality (based on abundance of year classes),
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Document Summary

Dominant commercial fisheries groups: finfishes, crustaceans, and molluscs, kelp. Stock fluctuations due to exploitation and environmental factors. Habitat loss and degradation have also played an important role. Controlling fishing effort through limits on harvest, gear, crew size, area, season, etc. Fatigue due to high density of water. Swimbladder problems because of the pressure/depth relationship. Stress from the temperature/dissolved oxygen relationship for poikilotherms. Turbidity problems, reduced primary production, invertebrate mortality, larval fish mortality, reduced foraging by visual predators. Bioaccumulation and biomagnification problems because of movement of chemicals across thin gill tissue. Indeterminate growth - fisheries advantage, continued growth through life, catch and release viable. Type iii survivorship, high fecundities, but high juvenile mortality. Complex trophic ontogeny requires consideration of food resources at all life history stages. High population diversity because of reproductive isolation. Evolutionarily significant units, designation of critical habitat under the esa. Complex life histories often result in high juvenile mortality. Important commercially harvested invertebrates - high economic value.