Satiation Time, Appetite, and Maximum Food Intake of Sockeye Salmon (Oncorhynchus nerka)

1971 ◽  
Vol 28 (3) ◽  
pp. 409-415 ◽  
Author(s):  
J. R. Brett
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Daily Basis ◽  
Fish Size ◽  
Stomach Body ◽  
Fish Weight ◽  
Voluntary Food Intake ◽  
Satiation Time

Three aspects of feeding relations in sockeye salmon (Oncorhynchus nerka) were studied, using Abernathy pellets. When food was presented in excess at 15 C, mean satiation time was found to be 43 ± 8 min, independent of fish size. Voluntary food intake (appetite) increased with time, approaching a plateau after 25–30 hr deprivation. The greatest increase in appetite occurred between 7 and 11 hr of fasting. The relation between the capacity of the stomach (% body weight) and fish weight (grams) was exponential (Y = 14.1 − 4.95 log10X). Five-gram fish consumed 11% dry body weight at one feeding, and 17% on a daily basis.

Relationship Between Thickness of Daily Growth Increments in Sagittae and Change in Body Weight of Sockeye Salmon (Oncorhynchus nerka) Fry

1982 ◽  
Vol 39 (10) ◽  
pp. 1335-1339 ◽  
Author(s):  
Kenneth H. Wilson ◽  
P. A. Larkin
Keyword(s):  
Body Weight ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Regression Line ◽  
Daily Growth ◽  
Daily Increments ◽  
Growth Increments ◽  
Fish Weight ◽  
Daily Change ◽  
Back Calculation

Sixty-four laboratory-reared sockeye salmon (Oncorhynchus nerka) fry were marked to enable identification as individuals. Each was weighed initially on June 6 or 8, 1979; and again on July 6; and surviving fish were weighed a third time on July 20. After the final weighing, sagittae were removed and a standard otolith radius, corresponding to each weight, was determined by counting back from the otolith edge the appropriate number of daily increments. The regression of ln otolith radius on ln fish weight was linear, with r2 = 0.92, demonstrating a relationship between mean thickness of a daily increment in sagittae, and mean daily change in weight of the fry. Using this regression line, previous weights were back calculated from corresponding otolith radii with errors in the order of 15%.Key words: otoliths, daily growth increments, back calculation, sockeye salmon

Effect of water content in a canned food on voluntary food intake and body weight in cats

2011 ◽  
Vol 72 (7) ◽  
pp. 918-923 ◽  
Author(s):  
Alfreda Wei ◽  
Andrea J. Fascetti ◽  
Cecilia Villaverde ◽  
Raymond K. Wong ◽  
Jon J. Ramsey
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Water Content ◽  
Canned Food ◽  
Effect Of Water ◽  
Voluntary Food Intake

Chronic treatment with long-acting bromocriptine does not affect duration of the breeding season, voluntary food intake, body weight, or wool growth in the Scottish blackface ewe

1991 ◽  
Vol 3 (1) ◽  
pp. 25 ◽  
Author(s):  
JD Curlewis ◽  
AM Sibbald ◽  
JA Milne ◽  
AS McNeilly
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Chronic Treatment ◽  
Vehicle Group ◽  
Plasma Prolactin ◽  
Wool Growth ◽  
Long Acting ◽  
Group B ◽  
Group D ◽  
Voluntary Food Intake

The aim of this study was to determine whether suppression of the seasonal increase in prolactin concentrations by chronic treatment with the dopamine agonist bromocriptine would affect onset of anoestrus, voluntary food intake, body weight, and wool growth in a seasonal breed of sheep. Groups of eight Scottish Blackface ewes were injected i.m. each week with either the vehicle (Group A) or 2.0 mg (Group B), 6.0 mg (Group C), or 18.0 mg (Group D) of bromocriptine in a long-acting formulation, commencing on 18 January and terminating on 25 July (midwinter to midsummer in the northern hemisphere). Immediately before the bromocriptine injection, blood samples were taken for progesterone and prolactin determination. Voluntary food intakes were measured daily, and body weights were recorded every fortnight. Estimates of wool growth were made by weighing wool clipped from a measured area of skin once a month. Treatment had no effect on onset of anoestrus, voluntary food intake, body weight, or wool growth. Plasma prolactin concentrations increased significantly in all groups during the treatment period. From January to April, all doses of bromocriptine significantly reduced prolactin concentrations but later in the study (May and June) prolactin was significantly suppressed in Group D only, although even in this group prolactin concentrations increased between March and June. Pituitary prolactin content, measured at the end of the study in July, was also suppressed by bromocriptine. The gradual increase in prolactin concentrations in ewes receiving chronic bromocriptine was further investigated by treating a fifth group of ewes (Group E) with 18.0 mg of long-acting bromocriptine each week, commencing on 20 June.(ABSTRACT TRUNCATED AT 250 WORDS)

Gill Dimensions as a Function of Fish Size

1969 ◽  
Vol 26 (1) ◽  
pp. 165-170 ◽  
Author(s):  
B. S. Muir
Keyword(s):  
Body Weight ◽  
General Equation ◽  
Published Data ◽  
Fish Size ◽  
Secondary Lamellae ◽  
Fish Weight ◽  
Gill Area ◽  
The Relationship

The relationship between total gill area and body weight can be expressed as Y + aWb where "b" varies from about 0.8 to 0.9 for different species. The area for a 1-g fish ("a") ranges 22-fold for published data on different species. Expressed by the same general equation, the number of secondary lamellae per millimeter of filament ranges 4-fold for different species and decreases with increasing fish weight within each species by a power of about −0.1.

Voluntary food intake in relation to body weight among British breeds of cattle

1986 ◽  
Vol 42 (1) ◽  
pp. 11-18 ◽  
Author(s):  
St C. S. Taylor ◽  
A. J. Moore ◽  
R. B. Thiessen
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Linear Regression ◽  
Regression Coefficient ◽  
Natural Logarithm ◽  
The Mean ◽  
Voluntary Intake ◽  
Relationship Of ◽  
The Relationship ◽  
Voluntary Food Intake

ABSTRACTVoluntary food intake and body weight were examined over 4-week intervals between 14 and 70 weeks of age in 306 females from 25 British breeds of cattle. At each age, the relationship of the natural logarithm of voluntary food intake to that of body weight was examined by linear regression both within and between breeds.Of the total variation in voluntary food intake, the proportion accounted for by body weight was extremely high between breeds (phenotypically, 0·80 or more; genetically 0·88 or more, at most ages) but phenotypically low within breeds (0·33 or less). The mean voluntary intake of a breed at any age could be predicted from its mean body weight at the same age with a coefficient of variation (CV) among breeds that declined with age from 0·08 to 0·04. Within breeds, the corresponding CV for individual intake was between 0·12 and 0·15 beyond 9 months of age, and even higher at early ages.Within breeds, the regression coefficient of log intake on log body weight was close to the value of 0·7 at all ages. Between breeds, it was over 0·8 at early ages, declining to about 0·7 beyond 1 year of age. Thus, genetically larger breeds voluntarily consumed relatively more food at early ages compared with later ages. Breed size should therefore be taken into account when recommending food intake requirements. Breed deviations for high and low appetite are discussed.

Multibreed comparisons of British cattle. Variation in body weight, growth rate and food intake

1984 ◽  
Vol 38 (3) ◽  
pp. 323-340 ◽  
Author(s):  
R. B. Thiessen ◽  
Eva Hnizdo ◽  
D. A. G. Maxwell ◽  
D. Gibson ◽  
C. S. Taylor
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Genetic Variation ◽  
Weight Gain ◽  
Food Intake ◽  
Daily Weight Gain ◽  
Daily Food Intake ◽  
Daily Food ◽  
Breed Selection ◽  
Voluntary Food Intake

ABSTRACTA multibreed cattle experiment involving 25 British breeds was set up to study genetic variation between breeds and genetic inter-breed relationships for a wide spectrum of traits in order to examine the problems of between-breed testing and selection. The experimental design is described and results on between-breed variation are presented for four traits.All animals were housed indoors and from 12 weeks of age were given a single complete pelleted diet ad libitum through a system of Calan-Broadbent electronic gates. Females were mated to produce one purebred and three crossbred calves, which were reared to slaughter in order to measure the efficiency of the cow-calf unit of production.Results based on a total of 292 animals, with an average of 12 per breed, are presented for body weight, cumulated voluntary food intake, daily weight gain and daily food intake over the age range from 12 to 72 weeks. The 25 breed-mean curves for body weight and cumulated food intake displayed a remarkably uniform pattern of rankings at all ages and the rankings were very similar for both traits.The multibreed design used was effective in estimating between-breed variation as a proportion of total variation for the four traits examined. After approximately 1 year of age, the proportion of variation between breeds was approximately 0·70 for body weight and 0·60 for cumulated voluntary food intake. Changes in these traits could therefore be brought about more effectively by selection between breeds rather than within breeds. For average daily weight gain measured over 12-week intervals, between-breed selection was estimated to be most effective in the period of maximum growth rate between 6 and 9 months of age, when between-breed variation was 0·52 of the total. For average daily food intake, measured over 12-week intervals, between-breed selection was likely to be effective beyond 6 months of age, when the proportion of between-breed variation plateaued at 0·48.At all ages, the coefficient of genetic variation between breeds was approximately 0·14 for body weight and daily gain, and remarkably constant at approximately 0·12 for both daily and cumulated food intake. It is suggested that, for growth and intake traits, the genetic variances within and between breeds remain proportional to each other at all ages.

scholarly journals Relationship between size-weight parameters of soсkeye salmon Oncorhynchus nerka smolts emigrated from Lake Azabachye (Kamchatka River basin) in 1979–2013 and abundance of mature fsh in the sea in 1982–2016

2018 ◽  
Vol 195 ◽  
pp. 128-139
Author(s):  
V. F. Bugaev
Keyword(s):  
Body Weight ◽  
River Basin ◽  
Body Length ◽  
Main Part ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
The Body ◽  
Positive Correlation ◽  
Kamchatka River

Two groups of juvenile sockeye salmon are feeding in Lake Azabachye. They belong to the 2nd order stock of the lake (stock A) and to other 2nd order stocks of middle and down stream tributaries of the Kamchatka River which underyearlings migrate into the lake for feeding and wintering (group E). The main part of the stock A leaves the lake to the sea at the age 2+ (mainly 2.3) and the youngsters of the group E migrate to the sea at the age 1+ (mainly 1.3). The body length and weight parameters of the stock A smolts at the age 2+ and the group E smolts at the age 1+ could be similar or dissimilar in particular years. The maximal difference between the smots of these stocks is observed in the years with higher body length and weight for the stock A. Mean for 1979–2016 length and weight of smolts at abovementioned ages are evaluated as 98.42/87.46 mm and 10.40/7.38 g for the A/E stocks. For the stock A, statistically signifcant positive correlation is noted between size-weight parameters of smolts in the years of emigration and their abundance in the years of mass return. However, the regression has a shift between the periods of emigration/return of 1979–2000/1982–2003 and 2003–2013/2006–2016. The correlation is higher for the frst period (r = 0.820; P < 0.001 for body weight and r = 0.797; P < 0.001 for body length, n = 16) than for the second one with higher abundance (r = 0.669; P < 0.05 for body weight and r = 0.711; P < 0.05 for body length, n = 11). On opposite, the returns of the group E depend weakly on size-weight parameters of its smolts for the period of emigration/return of 1979–1997/1982–2000 (no data for return in 1999) and the dependence is insignifcant for the period of 2000–2013/2003–2016.

scholarly journals Effects of long-term ad libitum feeding on the voluntary food intake, body weight, body composition and adipose tissue morphology of lean adult sheep

1982 ◽  
Vol 22 (6) ◽  
pp. 1049-1060 ◽  
Author(s):  
Françoise VANDERMEERSCHEN-DOIZÉ ◽  
Marie-Antoinette BOUCKOMS-VANDERMEIR ◽  
R. PAQUAY
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Adipose Tissue ◽  
Food Intake ◽  
Adult Sheep ◽  
Tissue Morphology ◽  
Ad Libitum ◽  
Ad Libitum Feeding ◽  
Voluntary Food Intake

Suppression of Food Intake in the Rat by Tung Oil

1973 ◽  
Vol 51 (10) ◽  
pp. 733-736 ◽  
Author(s):  
James C. McPherson Jr.
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Corn Oil ◽  
Caloric Intake ◽  
Stomach Tube ◽  
Adult Rats ◽  
Tung Oil ◽  
Voluntary Intake ◽  
Dry Food ◽  
Voluntary Food Intake

Tung oil has previously been found to suppress voluntary food intake when mixed with the diet. When tung oil or corn oil were fed by stomach tube to weanling and adult rats, the voluntary intake of laboratory chow was depressed by both lipids. The corn-oil fed animals readjusted their caloric intake to their prefeeding level in adults and to the level consumed by chow-only fed weanlings of the same age. However, the tung-oil fed adult animals consumed only one-half the dry food intake of the corn-oil fed animals (p < 0.001). Consequently the adult tung-oil fed animals lost significantly more (p < 0.01) of their body weight than did the corn-oil fed controls. This suggests that the mechanism of suppression of food intake by tung oil operates at some level other than taste or consistency of the diet.

Migration Timing, Size, and Salinity Tolerance of Sea-Type Sockeye Salmon (Oncorhynchus nerka) in an Alaska Estuary

1989 ◽  
Vol 46 (4) ◽  
pp. 633-637 ◽  
Author(s):  
Jonathan Heifetz ◽  
Scott W. Johnson ◽  
K V. Koski ◽  
Michael L. Murphy
Keyword(s):  
Salinity Tolerance ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
River Estuary ◽  
Fork Length ◽  
Habitat Types ◽  
Southeast Alaska ◽  
Fish Size ◽  
Migration Timing

Migration timing, size, and salinity tolerance were determined for sea-type sockeye salmon (Oncorhynchus nerka), which migrate to sea as underyearlings (age-0), in the Situk River estuary, Southeast Alaska. Ten sites in three habitat types were seined monthly from Sate April through August, 1987, and age-0 sockeye from the estuary were tested for salinity tolerance. Age-0 sockeye were most abundant (up to 13∙m−2) from late April through June, and by late July, most sockeye had left the estuary. Mean fork length (FL) was 31 mm in April and increased 0.4 mm∙d−1 to 70 mm in late July when most (72%) remaining sockeye had grown to about the same size as age-1 smolts (69–95 mm) emigrating in May and June. Mean FL of age-0 sockeye in the estuary in July was 23 mm greater than in freshwater areas of the river. Salinity tolerance was directly related to fish size, and a size of at least 50 mm was required for 100% survival in seawater. Because salinity in the estuary ranged 0–30‰, sockeye of all sizes could survive in the estuary. Thus, in 3–4 mo, sea-type sockeye attained a size large enough to adapt to seawater and migrate to sea.

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