摘要:

The saponification of fish liver oils may increase the activity of the vitamin D. In some cases the increases reached 100 per cent. That the increases were due to different activities of the esterified and free forms of the vitamin was demonstrated by a sample of vitamin D2palmitate undergoing a 250 per cent increase in activity upon saponification. Halibut liver oils showed anomalous behaviour in this respect, saponification resulting in either increased or unaltered activity, depending on the previous history of the material.

ISSN:0706-652X    

DOI:10.1139/f42-012

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

Pilchard oil and two fractions of salmon egg oil, despite their greater unsaturation, proved less effective than methyl linoleate in curing rats suffering from essential fatty acid deficiency. Herring oil, less unsaturated, was even less effective.

ISSN:0706-652X    

DOI:10.1139/f42-013

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

In experiments with fish liver oils, vitamin A alcohol was more readily adsorbed than it fatty acid esters or than triglycerides and other fatty acid esters. The vitamin A esters were less readily adsorbed than the triglycerides.

ISSN:0706-652X    

DOI:10.1139/f42-014

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

A direct bacterial count method applicable to fish muscle containing over approximately 1 × 105bacteria per gram, with a modification employing preliminary incubation for muscle containing fewer bacteria, is described. Direct counts generally yielded similar and somewhat higher results than viable counts. Mixed bacterial populations of fish muscle generally exhibited the growth phases characteristic of a pure bacterial culture. There was absolutely no relation between direct (or viable) counts obtained subsequent to such incubation and the initial viable counts of the samples studied. Bacteria increased much more rapidly in excised fish muscle than in whole fish, and somewhat more rapidly in halibut than in salmon flesh.

ISSN:0706-652X    

DOI:10.1139/f42-015

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

Fifty-seven species of Polychaeta are recorded, of which forty-nine are well known northern species, six are species which have been recorded previously from North America, but not from the north coast and two are new species forming a new genus,Pseudosabellides littoralisandlineata.

ISSN:0706-652X    

DOI:10.1139/f42-016

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

The yields per sq. m. computed as (1) av. wet wt. and (2) no. of organisms were: pool—36.91 g., 745; riffles—14.60 g., 1061; creek—8.25 g., 536. Vegetation is the most productive type of habitat, followed by mud, rubble, gravel bottom. The river may be designated as a "Trichopterastream". No close correlation was found between no. of organisms in bottom fauna and no. in trout stomachs, thus suggesting discrimination among trout for food organisms.

ISSN:0706-652X    

DOI:10.1139/f42-017

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

In the little-neck clam,Paphia staminea, as occurring in British Columbia waters, the first sign of the gonad was found in individuals slightly over 1 mm. in length. Sex differentiation occurs at lengths of 15 to 30 mm. or in 2nd or 3rd year. Maturity is achieved at 22 to 35 mm.P.stamineais not protandric. Seasonal gonad changes are: by end of October all active spawning over; by December to January tubules of ovary filled with follicle cells; active growth of sex cells reaches peak in March; first spawning in April and by September most clams spawned out. Male spawning cycle parallels that of female, with certain time lag apparent. Some males may remain in spawned-out state during most of winter.

ISSN:0706-652X    

DOI:10.1139/f42-018

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

The concentration of inorganic and total phosphorus in lobster blood and muscle was determined. A wide variation in the phosphorus content of the blood was found, being highest immediately preceding the moult and lowest following it. The total phosphorus content of the muscle was relatively constant throughout the moult cycle, with an average concentration of 0.28 per cent, of which about 58 per cent was inorganic phosphorus.

ISSN:0706-652X    

DOI:10.1139/f42-019

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

At Skutz falls, Cowichan river, B.C., fish migrated mainly during daylight hours. No correlation was found between diurnal fluctuations in number of migrants and volume or temperature of the water. Light seemed the determining factor. A moderate amount of artificial light had no effect on night migratory movements.

ISSN:0706-652X    

DOI:10.1139/f42-020

出版商:NRC Research Press    

年代:1943

数据来源: NRC

摘要:

Internal iron tags recovered by magnets demonstrate general movements of pilchards (Sardinops caerulea(Girard)) from Canadian to California fishing grounds. Consideration of recoveries in respect to tonnages of fish landed, size of fish landed, and efficiency of recovery show that in the first year after tagging, tagged fish are more concentrated on northern fishing grounds than on those of California. After the first year the reverse is true. Canadian tags during their first year are more concentrated on the fishing grounds off San Pedro than off central California. Later this condition is not observed. Fish of the 1939 year-class present in California waters in 1940 were taken by the Canadian fishery in 1941. The dates of recovery of first year tags on the United States coast indicate a rather orderly migration. Minimum estimate of the fastest rate of migration indicated gave 14.3 km. per day. In contrast to the inferred condition on major migrations, pilchard movements on northern fishing grounds are very confused. Definite movements from the Washington coast to the Canadian coast are demonstrated. Fish taken in the inlets of Vancouver island during the winter months are part of the general pilchard population. The total mortality rate of the large pilchards tagged in connection with Canadian fishing operations is about 71% per annum.

ISSN:0706-652X    

DOI:10.1139/f42-021

出版商:NRC Research Press    

年代:1943

数据来源: NRC