Lavinia exilicauda
Encyclopedia
The hitch Lavinia exilicauda is a cyprinid
fish
endemic to central California
, and once very common. The name is derived from the Pomoan word for this species.
The hitch shape is deep and laterally compressed, with a small head, and a terminal mouth pointing upwards. They are generally silver all over; younger fish have a black spot at the base of the tail, losing it as they age, and becoming generally darker as well. The anal fin is noticeably longer than for other California minnows, with 11-14 rays, while the dorsal fin has 10-13 rays, and is placed further back, the base being positioned between pelvic and anal fins. The tail fin is large and deeply forked. They can get large for minnows, with lengths of up to 36 cm. All of these features make them look much like the Golden Shiner
.
Hitch are omnivores of the open water, eating a combination of filamentous algae, insects, and zooplankton
. They can be found in lakes, sloughs, and slow-moving sections of rivers and streams. With the highest temperature tolerance among the native fish of the Central Valley, they can be found in both warm and cool water; they also have considerable salt tolerance, for instance occurring in Suisun Marsh
(7-8 ppt salinity), and Salinas River
lagoon (9 ppt).
Their range includes the Sacramento-San Joaquin system of the Central Valley, the Russian River
, Clear Lake, Pajaro River
, and Salinas River
. Although once abundant, and still commercially fished in Clear Lake, populations have been declining. The most likely cause appears to be loss of springtime spawning water flows due to water diversion and damming.
Cyprinid
The family Cyprinidae, from the Ancient Greek kyprînos , consists of the carps, the true minnows, and their relatives . Commonly called the carp family or the minnow family, its members are also known as cyprinids...
fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...
endemic to central California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, and once very common. The name is derived from the Pomoan word for this species.
The hitch shape is deep and laterally compressed, with a small head, and a terminal mouth pointing upwards. They are generally silver all over; younger fish have a black spot at the base of the tail, losing it as they age, and becoming generally darker as well. The anal fin is noticeably longer than for other California minnows, with 11-14 rays, while the dorsal fin has 10-13 rays, and is placed further back, the base being positioned between pelvic and anal fins. The tail fin is large and deeply forked. They can get large for minnows, with lengths of up to 36 cm. All of these features make them look much like the Golden Shiner
Golden shiner
The golden shiner is a cyprinid fish native to eastern North America. It is the sole member of its genus. Much used as a bait fish, it is probably the most widely pond-cultured fish in the United States.-Description:...
.
Hitch are omnivores of the open water, eating a combination of filamentous algae, insects, and zooplankton
Zooplankton
Zooplankton are heterotrophic plankton. Plankton are organisms drifting in oceans, seas, and bodies of fresh water. The word "zooplankton" is derived from the Greek zoon , meaning "animal", and , meaning "wanderer" or "drifter"...
. They can be found in lakes, sloughs, and slow-moving sections of rivers and streams. With the highest temperature tolerance among the native fish of the Central Valley, they can be found in both warm and cool water; they also have considerable salt tolerance, for instance occurring in Suisun Marsh
Suisun Marsh
Located in northern California the Suisun Marsh is the largest brackish marsh on west coast of the United States of America. The marsh land is part of the San Francisco Bay tidal estuary, and subject to tidal ebb and flood...
(7-8 ppt salinity), and Salinas River
Salinas River (California)
The Salinas River is the largest river of the central coast of California, running and draining 4,160 square miles. It flows north-northwest and drains the Salinas Valley that slices through the Coast Range south from Monterey Bay...
lagoon (9 ppt).
Their range includes the Sacramento-San Joaquin system of the Central Valley, the Russian River
Russian River (California)
The Russian River, a southward-flowing river, drains of Sonoma and Mendocino counties in Northern California. With an annual average discharge of approximately , it is the second largest river flowing through the nine county Greater San Francisco Bay Area with a mainstem 110 miles ...
, Clear Lake, Pajaro River
Pajaro River
The Pajaro River is a river in Northern California, forming part of the border between Santa Cruz County and Monterey County and between San Benito County and Santa Clara County.-History:...
, and Salinas River
Salinas River (California)
The Salinas River is the largest river of the central coast of California, running and draining 4,160 square miles. It flows north-northwest and drains the Salinas Valley that slices through the Coast Range south from Monterey Bay...
. Although once abundant, and still commercially fished in Clear Lake, populations have been declining. The most likely cause appears to be loss of springtime spawning water flows due to water diversion and damming.