摘要:

In gulf of St. Lawrence areasOdostomia trifidaTotten lives commensally the year round on the siphon ends of the soft-shell clam,Mya arenariaL.

ISSN:0706-652X    

DOI:10.1139/f47-022

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Sodium nitrite (0.02%) inhibited growth more than sulphathiazole (0.001–0.002%) or sulphanilamide (0.002%), but penicillin G (5–75 I.U. per 100 g.) and streptomycin (100–10,000 "S" units per 100 g.) had no important effect.

ISSN:0706-652X    

DOI:10.1139/f47-023

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Through the medium of specially-designed counting fences, records have been maintained of the adult pink salmon,Oncorhynchus gorbuscha, spawning in McClinton creek, Masset inlet, B.C. from 1930 to 1942, of the eggs available for deposition each season and of the fry resulting from these eggs. A loss of 76.2 to 93.1 per cent of the potential egg deposition occurs between the time of upstream spawning migration and the egress of the fry to sea. This mortality is assigned to a number of factors, some of which are briefly discussed. Within certain limits and under reasonably uniform climatic conditions smaller egg depositions provide greater efficiencies of hatch (percentage relationship of numbers of fry migrants to potential egg deposition). There thus appears a tendency toward rebuilding the run, herein termed "resilience," and believed to be closely bound up with the relationship between the fish and its physical and biological environment.

ISSN:0706-652X    

DOI:10.1139/f47-024

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Storage of frozen fish in high partial pressures of carbon dioxide or nitrogen effectively prevented fat oxidation and organoleptically detectable rancidity. Carbon dioxide stored fish developed an undesirable flavour not observed in that stored in nitrogen. Ice glazes formed from water or ethyl gallate solutions were about equally effective in delaying fat oxidation in frozen salmon steaks or fillets, but considerably less effective than 1-ascorbic acid or sodium 1-ascorbate glazes. Immersing salmon steaks or fillets in 1-ascorbic acid or sodium 1-ascorbate solutions strongly inhibited fat oxidation. 1-Ascorbic acid and closely related compounds were as effective, or more effective, than ethyl gallate or several other gallic acid derivatives for frozen fish. When 1-ascorbic acid was added to fish flesh its concentration fell rapidly at first, and then very slowly in the frozen fish.

ISSN:0706-652X    

DOI:10.1139/f47-025

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Streams in a rather rocky and barren region in Nova Scotia were found to have almost no algae and fish except in relation to farm operations. Placing of bags of chemical fertilizer along the shore was followed in a year or two by increased quantities of algae and fish downstream, the maximum effect only 150 yards away. It is concluded that fertilizing materials are held locally in flowing water in relation to finely divided bottom material, as with soils.

ISSN:0706-652X    

DOI:10.1139/f47-026

出版商:NRC Research Press    

年代:1948

数据来源: NRC