摘要:

The volatile base used as a measure of fish decomposition by Beatty and Gibbons, Journal of the Biological Board of Canada, Vol. III, 1936, has been shown to be trimethylamine, derived from the reduction of trimethylamine oxide.

ISSN:0706-652X    

DOI:10.1139/f38-008

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

During a six-year study of the migration of mature rainbow trout from Paul lake into Paul creek, British Columbia, characteristic daily and seasonal fluctuations were found. The peak of each daily run occurred in the early afternoon and the peak of the seasonal run began during the first spell of warm bright weather in spring after the ice left the lake. By using an index of the intensity of migration based on an estimate of the total number of spawners in the lake the seasonal fluctuations were related to such conditions as the direction of the wind, the temperature of the lake and creek, thunderstorms and the size of the fish.

ISSN:0706-652X    

DOI:10.1139/f38-009

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

The paper describes the first and second stage larvae ofPandalus stenolepishatched and reared in the laboratory and later stages obtained from plankton collections. The first stage is less well developed than that of any other known British Columbian pandalid but more advanced than is normal for Caridea.

ISSN:0706-652X    

DOI:10.1139/f38-010

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Salmon related to various rivers of eastern Canada were tagged and liberated after spawning, by the Department of Fisheries in various years from 1913 to 1936. Analysis of the recaptures shows varied movements, the differences from river to river and for the one river from year to year being seen as due to differences in the environment. When liberated in or even outside the estuary, they may enter and ascend the river while still in the kelt condition, if suitable freshets occur.As kelts and as clean fish in both first and second years after liberation, they are principally found in the estuary, distinctly more riverward than the virgin fish. However, when swept out of the estuary, as occurs in a river like the Margaree and, if return is difficult, their distribution will differ but little from that of the virgin fish.A pronounced zone of river influence in the sea is seen as holding the salmon to the locality near the river mouth, as for the Saint John river of New Brunswick. With an indistinct zone, more or less of the salmon wander to other regions, largely in correspondence with water movements.The length of time between successive spawnings is found to correspond with the time between the smolt stage and first spawning and to be related to sea temperature during the spring and summer.

ISSN:0706-652X    

DOI:10.1139/f38-011

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Sorption isotherms of salt fish muscle determined by the quartz spiral balance show that the material is isohygrometric between 0.30 and 0.754 activity and 15° to 35 °C. temperature. Above 0.754 the system acts as a saturated solution of sodium chloride.

ISSN:0706-652X    

DOI:10.1139/f38-012

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

In 1931, 1933, 1935, odd-numbered years, when no natural runs of pink salmon (Oncorhynchus gorbuscha) occur in the Masset area, British Columbia, transfers of eggs were made from the Tlell river on the east coast of Graham island to McClinton creek, a tributary of Masset inlet. The following free-swimming fry were released: from the 1931 experiment—753,646 normal and 124,002 "marked" by the removal of the adipose and left ventral fins, and from that of 1935—397,657 normal and 108,200 "marked" by the removal of the adipose and right ventral fins. From the former, 40 "marked" adults were recovered in the Fraser river fishery in 1933, and from the latter four "marked" adults at McClinton creek in 1937. In the 1933 experiment 540,294 eyed eggs were planted but these were destroyed by freshets the following winter. Possible reasons for the failure of these experiments and the absolute blank in the "off" years are suggested.

ISSN:0706-652X    

DOI:10.1139/f38-013

出版商:NRC Research Press    

年代:1938

数据来源: NRC