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Annulus formation on the scales of certain Michigan game fishesBeckman, William Curtis, January 1900 (has links)
Thesis (PH. D.)--University of Michigan, 1941. / Reprinted from Papers of the Michigan academy of science, arts, and letters, vol. XXVIII, 1942. Published 1943. Literature cited: p. 308-312.
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The development and relative growth of the scales of the Pacific herring (Clupea Pallasii)Gwyn, Agnes Margaret January 1939 (has links)
[No abstract available] / Science, Faculty of / Zoology, Department of / Graduate
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... The structure and growth of the scales of fishes in relation to the interpretation of their life-history with special reference to the sunfish Eupomotis gibbosus,Creaser, Charles William, January 1926 (has links)
Thesis (Ph. D.)--University of Michigan, 1924. / Thesis note on label mounted on t.p. Bibliography: p. 67-71.
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Über placoidschuppen in der mund- u. rachen-höhle der plagiostomen ...Steinhard, Otto. January 1902 (has links)
Inaug.-diss.--Bern. / "Literatur-verzeichnis": p. 5-[7].
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... The structure and growth of the scales of fishes in relation to the interpretation of their life-history with special reference to the sunfish Eupomotis gibbosus,Creaser, Charles William, January 1926 (has links)
Thesis (Ph. D.)--University of Michigan, 1924. / Thesis note on label mounted on t.p. Bibliography: p. 67-71.
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Pt. 1. Criteria and techniques of scale reading. Pt. 2. Life history of the steelhead Salmo gairdneri gairdneri Richardson as interpreted from the scalesMaher, Frank P. January 1954 (has links)
Criteria for interpretation of scales of steelhead (Salmo gairdneri gairdneri) and for their use in back calculation of early life history were established. With these criteria, features of the life history of 784 steelhead from the anglers' catches of the Chilliwack River, B. C. were studied. Age composition of adult steelhead runs from 1948 to 1953 was uniform except for the suggestion of a slightly dominant year class, represented as 4 year old fish in 1950, 5 year old fish in 1951 and 6 year old fish in 1952. There was no suggestion that fish of any particular age, life history, sex or length tend to return as adults at any particular season of the year. The age and size of smolts at migration is variable, with the majority however in the 2 and 3 year age groups and ranging in size from 15 to 20 cms.
Smolt migration usually occurs in March, with a small proportion of late migrants in August. Spawning frequency of adults was reviewed. Females generally spawn at an earlier age and more frequently than males.
It is concluded that the variability in the life history of the steelhead acts as a safeguard in its conservation. / Science, Faculty of / Zoology, Department of / Graduate
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Decadal-centennial variability in marine ecosystems of the northeast Pacific Ocean : the use of fish scales deposition in sediments /Holmgren, Diego, January 2001 (has links)
Thesis (Ph. D.)--University of Washington, 2001. / Vita. Includes bibliographical references (leaves 101-112).
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Scale patterns indicate changes in use of rearing habitat by juvenile coho salmon, Oncorhynchus kisutch, from 1955 to 1984 in the Tenmile Lakes, OregonGunnarsdottir, Hugrun 16 March 1992 (has links)
This study was designed to provide information about the juvenile life history of
coho salmon, Oncorhynchus kisutch, in the Tenmile Lakes in Oregon by 1) classifying
scales of spawning fish and outgoing smolts (1+), 2) assessing the contribution of
juvenile life history types to the returns of adults (3₂) and jacks (2₂), and 3)
comparing growth rates and survival of different types. Scales of outmigrating smolts
from one brood year, jacks from two brood years, and scales of adults from four
brood years were classified into juvenile life histories and examined for several scale
characters. A linear discriminant function analysis was used to show the separation
of the types and to determine the most distinguishing scale characters. Length of
smolts at ocean entry back-calculated from scales of jacks and adults was compared
with the length of the observed group of emigrating smolts.
Based on variation in numbers and spacing of circuli and the size of the
freshwater scale zone, believed to represent different residence time in the
tributaries and the lakes, four types of juvenile life histories were defined. Fish
classified as type 1, stream-reared, are believed to have reared in the tributaries until
migrating as smolts in the following year. Type 2, stream-lake-reared, fish are
thought to have reared in the tributaries for almost a year but then moved down to
the lakes, where rearing continued until smolt migration in spring. Type 3, stream-lake-
reared, are believed to have reared for a short time in the tributaries, then
moved down to the lakes sometime in their first year of life. Rearing continued in
the lakes until spring of the following year. Type 4, lake-reared, are thought to have
moved down to the lakes shortly after emergence from the gravel, where they reared
until migrating as smolts in the following spring. Scales of smolts, jacks, and adults
were sorted into these four types. Presently, coho salmon fry and yearlings appear
to be moving out of tributaries in late spring and from March to beginning of May,
respectively. Migration of smolts out of the lake system to the ocean occurs mostly
within the month of May. Recent habitat surveys show that dramatic seasonal
changes occur in use of rearing habitat by juvenile coho salmon in the Tenmile
Lakes tributaries from summer to winter. In winter juveniles appear to be using
more low gradient, low velocity, off-channel areas than in summer.
Fish of type 4 represented 90%, 43%, and 74% of the returns of adults in 1957-
58, 1963-64, and 1971-72, respectively, and 90% of the returns of jacks in 1962-63
and 1970-71. However, no type 4 fish was represented in the returns of adults in
1985-86, whereas type 1 fish represented 89% of the returns. Type 4 appeared to
have grown better in fresh water, reached a larger size at outmigration, and have a
greater relative survival than fish of type 2, when compared among the observed
group of smolts, returning jacks, and adults. The large proportion of the escapement
returning as jacks for some of the years may indicate good growing condition for
juvenile coho salmon in fresh water. According to the classification of jack scales
a large proportion of fish returning as jacks were lake-reared and were found to be
larger at migration to ocean than fish returning as adults. This may suggest that fish
that reared well in the lakes and reached a large size at outmigration had the
tendency to mature early and return as jacks.
Based on the analysis of scales, lake-reared juvenile coho salmon formerly
contributed well to adult returns. The former high returns of jacks and adults reflect
the importance of the lake habitat for the coho salmon populations of this system.
In order to enhance this stock to a higher level, management strategies should be
focused on making the lake habitat available to juvenile coho salmon for at least
some part of their freshwater life. / Graduation date: 1992
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Life histories of juvenile Chinook salmon (Oncorhynchus tshawytscha) in the Columbia River estuary as inferred from scale and otolith microchemistry /Campbell, Lance A. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 97-105). Also available on the World Wide Web.
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The functions and endocrine control of epithelial mucus secretion in the family CottidaeMarshall, William Smithson January 1977 (has links)
The mucus coat on the skin and gill of fishes serves a variety of protective functions including lubrication of the body surface, prevention of infection, and deterrence of parasites. Since mucus secretion in some teleosts appears to be controlled by the osmoregulatory hormones, prolactin
and Cortisol, it was thought that the mucus coat may participate in teleost hydromineral balance. The primary objective of this study was to -examine the possible role of mucus in-osmoregulation of Leptocottus arma- tus Girard 1854 (Teleostei, Cottidae) and to relate these findings to the -endocrine control of mucus secretion.
Whereas Leptocottus skin includes three types of secretory cells (eosinophilic
granular, goblet, and cuticle-secreting cells) , the gill epithelium -has only goblet cells. Of ten cottid species examined histochemically, only seawater sculpins produce neutral mucins, while fresh water, seawater,
and euryhaline species produce acidic mucins. Leptocottus primarily
secretes a sialoglycoprotein, though sulphated mucins are present in gill goblet cells and the cuticle-secreting cells. The granular cells produce a tryptophan-rich basic protein.
- Hypophysectomy or seawater adaptation reduce the number of gill goblet
cells, compared to respective sham-operated or 5% seawater-acclimated controls. Ovine prolactin treatment of hypophysectomized fish prevented this decrease. In seawater-acclimated Leptocottus prolactin injections increase the number of gill mucus cells, while Cortisol injections of 5% "seawater-adapted fish had the opposite effect. The cuticle-secreting cells were most active in 5% seawater-adapted fish and this state was maintained by prolactin. A moderately active state was typical of seawater-adapted
fish and this condition could be maintained by Cortisol or ovine growth hormone. The lowest activity of the cuticle-secreting cells occurred in hypophysectomized fish. Though prolactin and Cortisol appear to control
the gill goblet cells and the cuticle-secreting cells, neither hy-pophysectomy nor treatment with prolactin or Cortisol significantly affected
the skin goblet cells.
The mucus coat appears incapable of reducing integumental permeability
through steric interference of diffusion or through Donnan exclusion of ions from the mucus coat. Further, it is argued that enhancement of unstirred layers by mucus could not significantly affect hydromineral balance.
Instead, alterations of the mucus coat with environmental salinity may be associated with the lubricating properties of mucus. Leptocottus mucus is a viscous non-newtonian fluid when concentrated but is an efficient
lubricant when dilute. Seawater-adapted Leptocottus produce a more efficient lubricating mucus than do 5% seawater-acclimated fish; this effect appears to involve the cuticle-secreting cells.
In an associated study I showed that the skin of the goby Gillichthys mirabilis participates actively in osmoregulation through extra-renal ion excretion. Thus the effects of prolactin and Cortisol may be primarily to control active transport in the skin. / Science, Faculty of / Zoology, Department of / Graduate
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