摘要:

A parasitic copepod, encysted in the abdominal cavity and in the muscles of the red snapper,Sebastodes ruberrimus, caught off the Pacific Coast of Canada, has been identified asSarcotaces arcticus. Each cyst contained one female and one male copepod and had an opening through the skin of the fish by which, no doubt, the nauplius larvae are discharged.

ISSN:0706-652X    

DOI:10.1139/f47-040

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Fish flesh and certain waste materials were hydrolysed by tryptic enzymes of fish pyloric caeca. Fractionation of the resulting hydrolysates showed that they contained largely peptone, sub-peptone and residual (small peptides and amino acids) nitrogen, and little or no protein or proteose nitrogen. Fish flesh, milts, roes, meal, stickwater and a muscle myosin preparation were extracted to remove the fat, then dried and hydrolysed with acid or alkali. The essential amino acids arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, valine, tryptophane and tyrosine were determined in these enzyme-, acid- and alkali-hydrolysed materials by microbiological methods. The results have been summarized.

ISSN:0706-652X    

DOI:10.1139/f47-041

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The cyclic carbonyl enediols, reductic acid andl-ascorbic acid, strongly retarded fat oxidation in frozen minced red spring salmon or herring flesh stored at −10 or −20 °C., the former being more effective than the latter. The acyclic carbonyl enediols and dihydroxymaleic acid with its sodium and ammonium salts and reductone were either ineffective or afforded only slight protection.

ISSN:0706-652X    

DOI:10.1139/f47-042

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Nitrite-reducing bacteria are present on fresh cod fillets; the proportion increases during storage and they shortly become the predominating flora.Nitrite-reducing bacteria decrease the retarding action that small amounts of nitrite have on the bacterial reduction of trimethylamine oxide.

ISSN:0706-652X    

DOI:10.1139/f47-043

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The reduction of added nitrite in stored cod fillets is due to bacterial agencies. There are two mechanisms of nitrite reduction, the first inhibiting bacterial growth in acid media, and the second inhibiting trimethylamine oxide reduction in neutral solution. The effect of several levels of nitrite concentration on spoilage in fillets stored at 3 °C. as measured organoleptically and by spoilage tests was determined.

ISSN:0706-652X    

DOI:10.1139/f47-044

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Holding quahaugs and oysters through a growing season in circulation-controlled trays in Bideford river, Prince Edward Island, showed that they react differently to decreased water circulation. Quahaugs grow in proportion to the extent of circulation and can survive and grow significantly when there is very little water flow. Oysters are affected little by moderately reduced circulation but grow little and may die when the circulation is much reduced. Growth of quahaugs in beds is seriously reduced by eel-grass growing on the beds, and also by eel-grass merely in the vicinity of the beds. Growth curves are given for quahaugs in natural up-river and down-river beds and the difference in growth rate is attributed to difference in water circulation.

ISSN:0706-652X    

DOI:10.1139/f47-045

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Peptones were prepared from fish flesh by hydrolysis with (1) tryptic or peptic enzymes derived from fish digestive tracts, (2) inorganic acids followed by neutralization of the reaction mixture with an ion exchange resin, calcium hydroxide or barium hydroxide, and (3) sodium hydroxide followed by neutralization with an ion exchange resin. It was found that only those peptones which were prepared by enzyme hydrolysis consistently supported good growth of sixStreptococcus haemolyticuscultures and of oneClostridium botulinumtype E culture, and that these peptones were generally superior to three commercial peptones in supporting growth of the haemolytic streptococci.

ISSN:0706-652X    

DOI:10.1139/f47-046

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The reduction of trimethylamine oxide by heavy suspensions of washed cells of a number of species was greatly affected by the pH of the substrate, the more acid the reaction the slower was the reduction.

ISSN:0706-652X    

DOI:10.1139/f47-047

出版商:NRC Research Press    

年代:1949

数据来源: NRC