Biology of the Pile Perch, Rhacochilus Vacca in Yaquina Bay, Oregon PDF Download
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Author: Paul Gordon Wares Publisher: ISBN: Category : Fishes Languages : en Pages : 24
Book Description
Growth, reproduction, food habits, and parasites of pile perch were investigated in Yaquina Bay, Oregon between April 1966 and July 1967. The research disclosed that pile perch live at least 10 years. Males and females of given ages are close to the same size up to age IV, after which females are increasingly larger than males. The diet varies between seasons and localities. Pile perch are carnivorous feeders, obtaining food from the bottom or protruding surfaces in the littoral zone. Principal foods are barnacles, mussels, the bay clams, crabs, mud shrimp and tube dwelling amphipod. None of the pile perch examined was heavily parasitized. Infestations of gill copepods vary seasonally.
Author: Paul Gordon Wares Publisher: ISBN: Category : Fishes Languages : en Pages : 24
Book Description
Growth, reproduction, food habits, and parasites of pile perch were investigated in Yaquina Bay, Oregon between April 1966 and July 1967. The research disclosed that pile perch live at least 10 years. Males and females of given ages are close to the same size up to age IV, after which females are increasingly larger than males. The diet varies between seasons and localities. Pile perch are carnivorous feeders, obtaining food from the bottom or protruding surfaces in the littoral zone. Principal foods are barnacles, mussels, the bay clams, crabs, mud shrimp and tube dwelling amphipod. None of the pile perch examined was heavily parasitized. Infestations of gill copepods vary seasonally.
Author: Paul Gordon Wares Publisher: ISBN: Category : Perch Languages : en Pages : 146
Book Description
Data were gathered on the life history of the pile perch (Rhacochilus vacca) from Yaquina Bay, Oregon, between April, 1966, and July, 1967. Pile perch feed on the bottom and consume mostly molluscs, barnacles and decapod crustaceans. Food habits varied among seasons and locations within the bay, whereas the diet of young-of-the-year perch differed only slightly from the diet of older fish. Mating occurred from October to January and the young were born from mid-July to mid-August. Timing of the reproductive cycles coincided in the two years observed. The gestation period is approximately six months. Fecundity was positively correlated with lengths of fish. An intraovarian mortality rate of 4.8 percent was estimated. instantaneous daily growth rates in weight of 0.0606 for embryos and 9.0093 for newborn fish were estimated. About one-third of the females were mature at age III and nearly all were mature at age IV. Longevity exceeded ten years and maximum attainable lengths (100) of 432 and 490 mm (TL) were estimated for males and females, respectively. Females grew slightly faster than males. Few perch of age classes I and II were captured. Females generally occurred higher (upstream) in the bay than males. Pile perch were commonly host to the copepods, Clavella and Lepeoptheirus; the nematode, Cucullanus;and metacercariae of bucephalid trematodes. The rate of copepod infestations varied seasonally.
Author: Donald E. Bennett Publisher: ISBN: Category : Fishes Languages : en Pages : 32
Book Description
Data on certain aspects of the life history of the redtail surfperch were collected along the central coast of Oregon, from April 1967 through April 1969. Annulus formation occured during February through June, usually earlier in young than in older fish. Mating occurred from late December to early January, and the young were born from July through September. The number of embryos per female ranged from 1 to 39 (mean 13.3) and increased linearly with the length and weight of the females. Food of the fish from the surf zone included crustaceans (by far the most important group in both frequency of occurrence and total volume) and (in order of decreasing importance) fishes, mollusks, and polychaetes. Parasites of the redtail surfperch were immature nematodes (Anisakinae) ; the digenetic trematode Genitocotyle acirra; the monogenetic trematode, Diclidophora sp.; and the copepods, Caligus sp., Clavella sp., and Argulus catostomi.
Author: R. E. Putz Publisher: ISBN: Category : Cryptobia Languages : en Pages : 32
Book Description
Studies on two hemoflagellates of fish were carried out to determine biological parameters: host range, vector relations, in vivo culture, in vitro culture, pathogenicit, and cryogenic preservation.
Author: Publisher: ISBN: Category : Wildlife conservation Languages : en Pages : 174
Book Description
A bibliography comprising annotated citations of 2037 scientific and technical publications from ten series issued by the U.S. Fish and Wildlife Service. Includes a six-page introduction containing a history of the Service and a description of the research and development series.
Author: Paul Gordon Wares
Author: Paul Gordon Wares
Author: Paul G. Wares![Biology of Pile Perch, Rhacochilus Vacca in Yaquina Bay, Oreg. [with List of References] PDF](https://books.google.com/books/content/images/frontcover/2iqvAQAACAAJ?fife=w80-h100)
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Author: Paul Gordon Wares
Author: Donald E. Bennett
Author: Ronald A. Fritzsche
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Author: R. E. Putz
Author: Southwest Fisheries Center (U.S.)
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