![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=w150-h200)
Author: Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 21
Book Description
Biology of the Pile Perch, Rhacochilus Vacca in Yaquina Bay, Oregon
Author: Paul Gordon WaresPublisher:
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.
Biology of Pile Perch, Rhacochilus Vacca in Yaquina Bay, Oreg. [with List of References]
![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)
Author: Biology of the Pile Perch, Rhacochilus Vacca in Yaquina Bay, Oregon
Author: Paul G. WaresBiology of the Pile Perch (Rhacochilus Vacca)
Author: Paul Gordon WaresPublisher:
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.
Biology of the Redtail Surfperch (Amphistichus Rhodoterus) from the Central Oregon Coast
Author: Donald E. BennettPublisher:
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.
A Checklist of Parasites of California, Oregon, and Washington Marine and Estuarine Fishes
Author: Milton S. LovePublisher:
ISBN:
Category : Estuarine fishes
Languages : en
Pages : 598
Book Description
Research and Development Series
Author: Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 424
Book Description
Atlantic Salmon (Salmo Salar)
Author: Florence T. WrightPublisher:
ISBN:
Category : Atlantic salmon
Languages : en
Pages : 28
Book Description
North American stocks of Atlantic salmon (Salmo salar) have been declining. One measure being employed to reverse that trend is increased hatchery production. As with husbandry of other animals, intensive rearing is usually associated with higher than normal health risks. Research on diseases of Atlantic salmon can help prevent, reduce, or otherwise control mortality due to problem parasites, infections, and other diseases. For planning of research as well as for diagnostic work, health management, and husbandry, published information on diseases of the Atlantic salmon must be readily available. Inasmuch as the literature is widely scattered, the purpose of this work is to compile a bibliography from international sources on the diseases (detection, diagnosis, identification, and control) of Atlantic salmon. Most of the references are arranged alphabetically by author, either have been annotated by the staff of the Eastern Fish Disease Laboratory, or are abstracts by the author.
Acrolein, Dalapon, Dichlobenil, Diquat, and Endothal
Author: Leroy C. FolmarPublisher:
ISBN:
Category : Aquatic animals
Languages : en
Pages : 24
Book Description
Toxicity tables for the herbicides acrolein, dalapon, dichlobenil, diquat, and endothal list the test organisms, types of tests, experimental conditions, and test results. Each table is followed by a list of references. The materials provide a useful source of toxicity data on these herbicides to researchers, regulatory agencies, and manufacturers.
Author: