Growth, Feeding and Distribution of Yellow Perch Fry, Perca Fluviatilis Flavescens (Mitchill), During Their First Summer in West Blue Lake
Author: Brian Wai Hung Wong
Publisher:
Published: 1972
Total Pages: 0
ISBN-13:
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Author: Brian Wai Hung Wong
Publisher:
Published: 1972
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: Brian Wai Hung Wong
Publisher: National Library of Canada
Published: 1972
Total Pages: 92
ISBN-13:
DOWNLOAD EBOOKAuthor: Michael A. Henderson
Publisher:
Published: 1976
Total Pages: 270
ISBN-13:
DOWNLOAD EBOOKDistribution, mortality, growth, production and feeding habits of perch fry and their effect on the Daphnia pulicaria population of West Blue Lake was investigated. Perch hatched in the littoral zone in early June and moved into the pelagic zone 7 to 14 days later when they were 9 - l0 mm in length. Perch fry remained in the pelagic zone until they reached a length of approximately 25 - 30 mm in mid-July, and then returned to the littoral area. Instantaneous daily mortality rates ranged from .017 in areas of low perch fry abundance to .140 in areas of high perch fry abundance. From hatching until mid-August perch fry increased in length and dry weight by a factor of 10 and 2616 respectively. Growth occurred in two distinct stanzas. The first stanza, from hatching until the beginning of the pelagic phase, was characterized by a low level of feeding and a slow growth rate, while the second stanza, lasting for the remainder of the summer, was characterized by a high level of feeding and a fast growth rate. Variation in the energy intake and growth of perch fry in different parts of the lake was directly dependent upon the abundance of Dacphnia pulicaria-...Decreases in the abundance of Daphnia pulicaria in areas of the lake with low numbers of perch fry indicated that these populations may decline independently of fish predation...
Author: Yao-Sung Lin
Publisher:
Published: 1975
Total Pages: 224
ISBN-13:
DOWNLOAD EBOOKAuthor: W.D.N. Busch
Publisher: CRC Press
Published: 2018-01-18
Total Pages: 238
ISBN-13: 135108559X
DOWNLOAD EBOOKIn the context of freshwater fisheries changing their strategies from the regulation of harvest and the enhancement of populations, to the creation and protection of habitats and the management of ecosystems, moves toward establishing an aquatic habitat classification system. Eight papers, from the February 1988 Symposium on the Classification and Inventory of Great Lakes Aquatic Habitats (the last in a series of Great Lakes Symposia), propose various classification approaches, most using a limited number of physical, chemical, and/or biological variables to produce some form of index. They also include overviews and summaries of the classification process.
Author: International Association of Theoretical and Applied Limnology
Publisher:
Published: 1978
Total Pages: 702
ISBN-13:
DOWNLOAD EBOOKAuthor: Fisheries Research Board of Canada
Publisher:
Published: 1977
Total Pages: 760
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1977
Total Pages: 564
ISBN-13:
DOWNLOAD EBOOKAuthor: Michael Alan Oetker
Publisher:
Published: 1998
Total Pages: 450
ISBN-13:
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