摘要:

The relations of relative humidity (R.H.) to water content in precooked, air-dehydrated fish were determined with reference to the mould, bacterial and volatile-base content of stored samples. In general it was found that visible mould developed only in samples stored at 80% or higher R.H., while bacteria increased only at 85% or higher R.H. Viable bacteria and moulds decreased slowly in samples stored at R.H. too low to support their active multiplication. Total volatile bases and trimethylamine increased in samples stored at R. H. too low for growth of either bacteria or moulds.

ISSN:0706-652X    

DOI:10.1139/f42-036

出版商:NRC Research Press    

年代:1945

数据来源: NRC

摘要:

Salmon (Salmo salar) kelts from hatchery operations, when liberated in rivers and in or near river estuaries, show by the distribution of the recaptured fish an extent of seaward migration that varies from river to river, apparently in relation to the character of the estuary and river influence in the sea. For the very large St. John river (N.B.) they are mainly in the long, deepish estuary and rarely leave the zone of river influence, while for the smallish Margaree river (N.S.), with a short, shallow estuary well emptied by the tide, they are mainly near the coast outside the estuary and commonly wander to distant places in various directions. This distribution may (Margaree) or may not (St. John) correspond with that of virgin fish. The Miramichi (N.B.) with strong river influence and long estuary resembles the St. John, while the Annapolis and Philip rivers (N.S.) with slight river influence are more like the Margaree.For each river and location of liberation, the extent of seaward distribution is found to vary with differences in river discharge during a presumed settling-down period after liberation. Sharp freshets are correlated with more riverward distribution at least for a time. Heavy floods are correlated with a more seaward distribution. Continued low water is correlated with a wide distribution.

ISSN:0706-652X    

DOI:10.1139/f42-037

出版商:NRC Research Press    

年代:1945

数据来源: NRC

摘要:

Variations from 8.15 to 0.96 per cent in the glycerol yield from twelve dogfish (Squalus suckleyi) liver oils are reported and shown to be inversely related to their 7.6 to 34.3 per cent yield of unsaponifiable matter, or, better, to their 6 to 31 per cent yield of glyceryl ethers. The glycerol determinations are confirmed by an independent method involving a comparison of the hydroxyl group and replaceable hydrogen contents of the hydrolyzed oils.

ISSN:0706-652X    

DOI:10.1139/f42-038

出版商:NRC Research Press    

年代:1945

数据来源: NRC

摘要:

Whitefish parasitized with plerocercoids ofTriaenophorus crassusare slightly shorter and considerably lighter than non-parasitized fish of the same age. Heavily parasitized tullibee (Leucichthyssps.) grow slightly more slowly than lightly parasitized fish.Whitefish are more affected by the parasites than tullibee, a fact which favours the argument thatLeucichthyssps. are the more natural hosts forT.crassus.

ISSN:0706-652X    

DOI:10.1139/f42-039

出版商:NRC Research Press    

年代:1945

数据来源: NRC

摘要:

Methods are given for the estimation of acids, phenols, acetone and colour in smoked fish products. The concentration of phenols in commercial smoked fish ranges from 1.0 mg. per 100 g. of fish in smoked sardines to 35 mg. in hard-cured herring.Predrying and low smoke velocities decrease the rate of deposition of smoke constituents on the fish. Although volatile phenols are not directly associated with colour development in smoked fish, the concentration of phenols and depth of colour parallel one another. The smoke constituents are shown to be concentrated in the surface layers of the smoked fish.

ISSN:0706-652X    

DOI:10.1139/f42-040

出版商:NRC Research Press    

年代:1945

数据来源: NRC

摘要:

From 0.001 to 0.024% hydroxylamine caused transient or permanent growth inhibition of fish spoilage and certain other bacteria.

ISSN:0706-652X    

DOI:10.1139/f42-041

出版商:NRC Research Press    

年代:1945

数据来源: NRC