Teejay A. O'Rear and Peter B. Moyle
- Published in print:
- 2014
- Published Online:
- September 2014
- ISBN:
- 9780520276086
- eISBN:
- 9780520957329
- Item type:
- chapter
- Publisher:
- University of California Press
- DOI:
- 10.1525/california/9780520276086.003.0007
- Subject:
- Biology, Ecology
Suisun Marsh is a vital region for desirable fishes and invertebrates. Vegetated banks, high turbidity, variable salinity, dendritic channels, and high hydrologic residence times support highly ...
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Suisun Marsh is a vital region for desirable fishes and invertebrates. Vegetated banks, high turbidity, variable salinity, dendritic channels, and high hydrologic residence times support highly productive food webs. The fish community is a mixture of native and nonnative species. Populations of many fishes have declined over the last thirty years, paralleling trends seen in the delta. As salinity increases in the marsh, the proportion of native fishes will increase; however, the saltier water of the future marsh will likely become less hospitable to some desirable estuarine fishes, such as striped bass and delta smelt. The future marsh will remain an important habitat for migratory fishes, such as white sturgeon, while also becoming a valuable nursery ground for salt-tolerant fishes such as Pacific herring and northern anchovy.Less
Suisun Marsh is a vital region for desirable fishes and invertebrates. Vegetated banks, high turbidity, variable salinity, dendritic channels, and high hydrologic residence times support highly productive food webs. The fish community is a mixture of native and nonnative species. Populations of many fishes have declined over the last thirty years, paralleling trends seen in the delta. As salinity increases in the marsh, the proportion of native fishes will increase; however, the saltier water of the future marsh will likely become less hospitable to some desirable estuarine fishes, such as striped bass and delta smelt. The future marsh will remain an important habitat for migratory fishes, such as white sturgeon, while also becoming a valuable nursery ground for salt-tolerant fishes such as Pacific herring and northern anchovy.
Rodney B. Pierce
- Published in print:
- 2012
- Published Online:
- August 2015
- ISBN:
- 9780816679546
- eISBN:
- 9781452947761
- Item type:
- chapter
- Publisher:
- University of Minnesota Press
- DOI:
- 10.5749/minnesota/9780816679546.003.0002
- Subject:
- Biology, Ecology
This chapter examines the effects of fishing on northern pike populations. In lakes where pike have good access to spawning and nursery habitat, overfishing generally leads to higher densities of ...
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This chapter examines the effects of fishing on northern pike populations. In lakes where pike have good access to spawning and nursery habitat, overfishing generally leads to higher densities of small pike because long-term exploitation can result in compensatory recruitment, where fishing actually stimulates the addition of new small pike to the population. An 11-year study at Heming Lake, Manitoba, showed that although pike populations increased with growing fishing pressure, the average size of pike declined. Another study found that the age when pikes matured corresponded with their mortality rates. Increasing levels of fishing intensity seemed to induce higher total mortality rates and earlier ages at first reproduction.Less
This chapter examines the effects of fishing on northern pike populations. In lakes where pike have good access to spawning and nursery habitat, overfishing generally leads to higher densities of small pike because long-term exploitation can result in compensatory recruitment, where fishing actually stimulates the addition of new small pike to the population. An 11-year study at Heming Lake, Manitoba, showed that although pike populations increased with growing fishing pressure, the average size of pike declined. Another study found that the age when pikes matured corresponded with their mortality rates. Increasing levels of fishing intensity seemed to induce higher total mortality rates and earlier ages at first reproduction.
