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Semelhante a The sacramento perch
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The sacramento perch
- 2. The Sacramento Perch attributes • The Sacramento Perch (Archoplites interruptus) is the only native Sunfish to the Western United States. • The Sacramento Perch, is actually not classified a Perch but a member of the Centrarchidae family. • They can grow up to 12 inches long and live up to 6 years.
- 3. The Sacramento Perch History • 1861.The California Legislature authorizes the Reclamation District Act, allowing drainage of Sacramento–San Joaquin –Delta lands and construction of sturdier levels, eliminating vast amounts of habitat previously occupied by perch. • 1872. J. A. Poppe introduces common carp (Cyprinus carpio) from Germany into a pond in the Sonoma Valley; this species is found to prey on perch eggs and destroy spawning substrates. • 1888–1899. Sacramento perch are noted as an important food fish in San Francisco fish markets with 40,000 to to 432,000 pounds of fish harvested per year during this period. It is likely that these fish came from the lower Sacramento River and Sacramento–San Joaquin Delta. • 1930. Sacramento perch are described as abundant in Clear Lake (Coleman 1930). • 1931. Neal (1931) notes that the perch are found “only in the few places where the non-native [fish]species are rare or absent." • 1950–1960s. Sacramento perch are found to be largely absent from the Delta in surveys by the California. • 1980. Vanicek (1980) describes the decline of the Lake Greenhaven population and speculates that introduced centrarchid fishes (mainly bluegill) are the cause of decline. • 1995. CDFG lists the Sacramento perch as a Species of Special Concern.
- 4. The Sacramento Perch diet Sacramento Perch are mostly piscivorous (fish eaters). They also eat: • Amphipods(malacostraca crustaceans) • Copepods(crustaceans) • Cladocereans(zooplankton) • Chironomids(small flies) • Beetles • Caddisflies, • Dragonfly/ damselfly nymphs • Insect larvae • Snails
- 5. Sacramento Perch feeding comparison 60 50 40 30 20 10 0 amphipods cladocerans copepods chironomids insects unknown
- 6. The Sacramento Perch Habitat • Sloughs • Lakes • Ponds • Rivers They can be found mostly near the gravel in sluggish waters and by submerged Turfa Rocks ,off shore, where it is easy for them to catch minnows. They are known to be able to survive in extreme conditions such as temputure, water quality,and salinity.However, they are senstive to low water levels.
- 7. Sacramento Perch Spawning • Sacramento Perch spawn over large cobble, • gravel, and on vegetation. • The average spawning time is 3-8 days • The best temputure for spawning is 28- 25 degrees Celsius • They spawn in mid june to early July
- 8. The Sacramento Perch Geography • Sacramento Perch are native to Sacramento, San Joaquin Valley, Pajaro, and Salinas River. However they have been widely introduced throughout the United States. • You can catch the Sacramento perch at Crowley Lake near Bishop, Pyramid Lake in Nevada or Lagoon Valley Lake between Fairfield and Vacaville.
- 9. Why the decline in Sacramento Perch population? • Sacramento Perch do not protect their nests and were steadily replaced in the ecosystem by the bass, crappie and bluegill. • Competition for food and space with exotic Centrachids. • Reduced abundance of native cyprinid prey. • Habitat degradation. • Predation. • Chemical Environmental Factors. • Low Water Level.
- 10. Why bring the Sacramento Perch back to Sacramento? • Sacramento Perch are known to control the mosquito population by feeding off mosquito larvae. • They taste good! • They are almost considored endangered. • They are the only native to the Sunfish family in California.