Inhibition of smolting in precocious male chinook salmon, Oncorhynchus tshawytscha

The ontogeny of precocious maturation in chinook salmon from Nicola River, British Columbia, was examined in conjunction with the effects of such maturation on smoltification and growth. A high proportion (56%) of male parr matured as yearlings. The growth patterns of precocious males and nonmaturing individuals of both sexes differed significantly. Precocious males appeared to grow rapidly relative to nonmaturing individuals in the early spring, but thereafter displayed a decreasing specific growth rate. In addition, precocious individuals gained more weight per increment of body length than nonmaturing individuals. The seawater adaptability of precocious individuals was lower than that of nonmaturing individuals at the three monthly sampling periods and decreased steadily as maturation proceeded.

Download Full-text

Influence of Sustained Exercise at Two Ration Levels on Growth and Thyroid Function of All-Female Chinook Salmon (Oncorhynchus tshawytscha) in Seawater

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f94-200 ◽

1994 ◽

Vol 51 (9) ◽

pp. 1975-1984 ◽

Cited By ~ 39

Author(s):

A. Kiessling ◽

D. A. Higgs ◽

B. S. Dosanjh ◽

J. G. Eales

Keyword(s):

Growth Rate ◽

Specific Growth Rate ◽

Chinook Salmon ◽

Feed Efficiency ◽

Oncorhynchus Tshawytscha ◽

Specific Growth ◽

Fork Length ◽

Hepatosomatic Index ◽

Rate Condition ◽

Body Protein

Duplicate groups of seawater-adapted 70-g all-female chinook salmon (Oncorhynchus tshawytscha) were held in flowing seawater (24–29‰; 8–12 °C) corresponding to swimming speeds (SS) of 0.5, 1.0, or 1.5 body lengths (bl)/s for 212 d. Fish were fed either a maximum satiating ration of 75% of maximum ration at each SS. Fish grew four- to fivefold during the study, but neither mean body weight, fork length, specific growth rate, condition factor, nor muscle morphometry was influenced by average SS. However, the SS of individually marked fish were negatively correlated with specific growth rate. At both rations, higher SS increased the internal tissue-carcass ratio, hepatosomatic index, and total body protein. More food was ingested at higher SS resulting in reduced feed efficiency. SS did not alter the plasma L-thyroxine (T4) concentration, but increased the plasma 3,5,3′-triiodo-L-thyronine (T3) concentration and T3/T4 ratio. In part, this may reflect the greater food intake at higher SS. The reduced ration depressed all aspects of growth and at 212 d tended to depress both plasma T4 and T3, but did not alter feed efficiency. We conclude that exercise over the range of 0.5–1.5 bl/s does not enhance growth, but reduces feed efficiency in seawater-adapted chinook salmon.

Download Full-text

Features of growth and development of egg cross chicken embryos «Lomann Brown»

Genetika i razvedenie zhivotnyh ◽

10.31043/2410-2733-2021-1-29-36 ◽

2021 ◽

pp. 29-36

Author(s):

M. Chelnokova ◽

A. Chelnokov

Keyword(s):

Growth Rate ◽

Body Weight ◽

Specific Growth Rate ◽

Body Length ◽

Specific Growth ◽

Allometric Growth ◽

Chicken Embryos ◽

Body Sizes ◽

The Impact ◽

Fetal Stage

Purpose: to study morphometric parameters of absolute values of linear and weight body sizes, specific growth rate and relative (allometric) growth of chicken embryos of the «Lohmann Brown» egg cross at different stages of embryogenesis.Materials and methods. The absolute values of linear and weight body sizes of chicken embryos were estimated using morphometric methods. The formula of I. I. Schmalhausen and S. Brody was calculated the specific growth rate of length and body weight of chicken embryos by the formula simple allometry — relative (allometric) growth of body length from body mass.Results. This is manifested in the increase in the specific growth rate of body length of the embryo at 5 days of the late-fetal stage, 8th, 10th, 12th day of the early-fetal stage and specific growth rate of body mass for 6 days of the late-fetal stage of the late-fetal stage, 10-th and 12-th day of the early-fetal stage. At all stages of embryo development, there is a negative allometry of the relative growth rate of the embryo body length, except for 14 days of the mid-fetal stage, where negative isometry was observed (b=-1,000). Higher values of the power coefficient reflecting the slower growth of the embryo in length relative to their body weight, observed in late-fetal stage at 5-6 days (b=0,913-0,995), in early-fetal stage — 10-e (b=0,960) and 12 days (b=0,928), in mid-fetal stage — 13-th (b=0,821) and 15 days (b=0,981) and late-fetal stage — 20 days (b=0,836).Conclusion. New knowledge derived from this study can be applied not only in research, but in the poultry industry to assess the impact of preincubation processing of eggs on the development of embryos and embryonic mortality at different stages of embryogenesis, the definition of normal and abnormal development of embryos, as well as to assess the impact of other factors, artificial incubation on embryo development, hatchability of eggs and safety of poultry.

Download Full-text

The Fecundity Of Pacific Herring (Clupea pallasi) in British Columbia Coastal Waters

Journal of the Fisheries Research Board of Canada ◽

10.1139/f58-017 ◽

1958 ◽

Vol 15 (3) ◽

pp. 313-330 ◽

Cited By ~ 10

Author(s):

Fuzuko Nagasaki

Keyword(s):

Growth Rate ◽

British Columbia ◽

Body Length ◽

Coastal Waters ◽

Early Spring ◽

Pacific Herring ◽

Clupea Pallasi ◽

Relationship Of ◽

The Relationship

The fecundity of Pacific herring was investigated from a collection of 600 ovaries gathered from various localities along the British Columbia coast during the winter and early spring of 1954–55. It was found that fecundity depended mainly on body length and to a lesser extent on age, independently of its effect on body length. Certain differences in fecundity, found between herring from various localities when die relationship of fecundity to body length was considered, were not found when the relationship between fecundity, body length and age was considered. These differences were attributed to differences in growth rate. Fecundity of herring of same body length and the same age was found to be significantly higher in northern British Columbia than in southern.

Download Full-text

Pengaruh Pemberian Pakan Alami Dan Pakan Buatan Terhadap Pertumbuhan Benih Ikan Betutu (Oxyeleotris marmorata bleeker)

Jurnal Ilmiah Perikanan dan Kelautan ◽

10.20473/jipk.v1i1.11698 ◽

2019 ◽

Vol 1 (1) ◽

pp. 51 ◽

Cited By ~ 1

Author(s):

Muhammad Arief, Irmaya Triasih, Widya Paramita Lokapirnasari

Keyword(s):

Growth Rate ◽

Specific Growth Rate ◽

Body Length ◽

Specific Growth ◽

Quality Data ◽

Test Parameter ◽

Length Growth ◽

Weight Growth ◽

Anadara Granosa ◽

The Way

Abstract The growth of betutu classified slow, so do efforts in order that growth of betutu which protected optimal by choosing the exact food combination. This research is purpose to know the growth fingerlings of betutu. This research using complete random program giving 3 repeated by the way of treating P1 (food 100% pelet), P2 (food 100% Daphnia spp.), P3 (food 100% Tubifex sp.), P4 (food 100% Anadara granosa), P5 (food combination 50% pelet and 50% Daphnia spp.), P6 (food combination 50% pelet and 50% Tubifex sp.), P7 (food combination 50% Anadara granosa and 50% Daphnia spp.), P8 (food combination 50% Anadara granosa and 50% Tubifex sp.). Main test parameter checked on this research is growth (accretion weight), growth rate, specific growth rate, and absolute body length growth, while supporting test parameter is water quality. Data of growth analysis using ANAVA (varian analysis) and if there is the influence the way of treating so continued with Test of Multiple Gap Duncan by trusty degree 95%. The result of research show the growth (accretion weight), growth rate, specific growth rate and the best absolute body length growth on the way of treating P6 which not different with the way of treating P3 and P8.

Download Full-text

Effect of Fractal-Like Aggregation on Radiative Properties and Specific Growth Rate of Chlorella

Proceedings of the 15th International Heat Transfer Conference ◽

10.1615/ihtc15.rad.009531 ◽

2014 ◽

Author(s):

Zhen-Zong He ◽

Hong Qi ◽

Qin Chen ◽

Ya-Tao Ren ◽

Li-Ming Ruan

Keyword(s):

Growth Rate ◽

Specific Growth Rate ◽

Specific Growth ◽

Radiative Properties

Download Full-text

Effects of Mucin, Haemoglobin and Collagen on the Maximum Specific Growth Rate, Biomass and Hydrolytic Enzyme Production ofPorphyromonas gingivalisin Continuous Culture

Microbial Ecology in Health and Disease ◽

10.3402/mehd.v4i5.7714 ◽

1991 ◽

Vol 4 (5) ◽

Author(s):

T. Minhas ◽

J. Greenman ◽

A. G. Schaffer

Keyword(s):

Growth Rate ◽

Specific Growth Rate ◽

Continuous Culture ◽

Enzyme Production ◽

Specific Growth ◽

Hydrolytic Enzyme ◽

Maximum Specific Growth Rate

Download Full-text

Analysis of straying variation in Alaskan hatchery chinook salmon (Oncorhynchus tshawytscha) following transplantation

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f98-199 ◽

1999 ◽

Vol 56 (4) ◽

pp. 578-589 ◽

Cited By ~ 31

Author(s):

Jeffrey J Hard ◽

William R Heard

Keyword(s):

British Columbia ◽

Chinook Salmon ◽

Oncorhynchus Tshawytscha ◽

Release Site ◽

Substantial Variation

In 1976 chinook salmon (Oncorhynchus tshawytscha) gametes from the Chickamin and Unuk rivers in southeastern Alaska were transplanted 250 km to establish hatchery runs at Little Port Walter (LPW), Baranof Island. From 1977 to 1989, 1 862 058 marked smolts from 12 broods were released from LPW. Homing and straying were estimated from adult recoveries at 25 locations in Alaska and British Columbia between 1981 and 1989. Of 22 198 LPW fish recovered over this period, 21 934 (98.8%) were collected at LPW. Of 264 fish recovered elsewhere, 38.3% were within 7 km of LPW; 64.4% were within 25 km of LPW. No LPW fish were recovered from the ancestral rivers, but nine fish were recovered from rivers supporting wild chinook salmon. Straying declined with distance from the release site but varied between hatcheries and streams. Straying declined with increasing age and run size. Straying was similar between the populations but varied among broods, and analysis of straying in experimental groups provided evidence for a heritable component. Males strayed more often than females. Population, gender, run size, and recovery age interacted to produce substantial variation in straying, indicating that run composition can produce complex straying responses.

Download Full-text