摘要:

Analytical taste panel results showed that immersion-thawing in tap water at two different temperatures (7.2 and 15.5 C) and dielectric thawing (at 38 Mc/s) had similar effects on the cold-storage life (at −23 C) of processed, refrozen fillets of cod (Gadus morhua) and of redfish (Sebastes marinus mentella) (water thawing at 15.5 C only).Refrozen fillets from Grand Bank cod, captured in March, iced 4 days and frozen, water-thawed, and reprocessed as above, though not quite as good as once-frozen controls, were still of good quality after 35 weeks storage.Lightly feeding June trap cod, captured in cool (4 C) inshore water, iced, and frozen before and during rigor mortis, then water-thawed and refrozen, were still acceptable after 28 weeks storage, but were considerably poorer than samples frozen once. Quality was similar at both thawing, temperatures (7.2 and 15.5 C) and both conditions of rigor at first freezing.Heavily feeding July trap cod, captured in warmer (7–9 C) inshore water, similarly handled and similarly processed and refrozen following thawing in water at 15.5 C or dielectrically, were of just acceptable quality up to 32 weeks in storage and were similar to samples frozen once.Grand Bank redfish, similarly frozen before and during rigor and later processed and refrozen, maintained very acceptable quality up to 28–34 weeks with both thawing procedures and state of rigor at freezing and were equal to samples frozen once. Thiobarbituric acid values increased on storage.

ISSN:0706-652X    

DOI:10.1139/f67-011

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

By reason of its geographical distribution, the Arcto-Norwegian cod (Gadus morhua) supports three distinct fisheries, two feeding fisheries in the Barents Sea and at Bear Island–Spitsbergen, and a spawning fishery off the Norway coast. In the past this diversity of fishing on the one stock has made it difficult to unify all the data to give an overall description of post-war changes in the stock. In this contribution three modifications of conventional procedures are introduced which enable this to be done. These are: (i) a system of weighting the catch per unit effort data from each fishery to a level of comparability; (ii) a more rigorous definition of the effective fishing effort on each age-group; (iii) a method of estimation of the effective fishing effort on partially recruited age-groups.Using these methods the analysis presents the effects of fishing on each fishery in the context of its effect on thetotalstock, and at the same time it indicates ways in which factors other than fishing may have influenced the apparent abundance of the stock. The treatment of the data is also used to derive estimates of spawning stock and recruitment of 3-year-old cod for subsequent analysis of stock–recruitment relationships.

ISSN:0706-652X    

DOI:10.1139/f67-012

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

The "minimum response" level ofSalmo truttato an alternating current field increased with angle to the field, temperature, resistivity, and fatigue, with a wide range of individual variation. The drop in potential across the length of a fish ("body-voltage") varies directly with length and is not a constant for the species in either fresh or salt water. Embryo trout show a fully developed response 2 weeks after hatching.

ISSN:0706-652X    

DOI:10.1139/f67-013

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-014

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-015

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-016

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-017

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-018

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-019

出版商:NRC Research Press    

年代:1967

数据来源: NRC

摘要:

not available

ISSN:0706-652X    

DOI:10.1139/f67-020

出版商:NRC Research Press    

年代:1967

数据来源: NRC