Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support

Commercial Blast-Freezing of Third-Stage Anisakis simplex Larvae Encapsulated in Salmon and Rockfish

Thomas L. Deardorff and Richard Throm
The Journal of Parasitology
Vol. 74, No. 4 (Aug., 1988), pp. 600-603
DOI: 10.2307/3282175
Stable URL: http://www.jstor.org/stable/3282175
Page Count: 4
  • Get Access
  • Read Online (Free)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Commercial Blast-Freezing of Third-Stage Anisakis simplex Larvae Encapsulated in Salmon and Rockfish
Preview not available

Abstract

Sixty-four fish were blast-frozen to -35 C for 15 hr to determine the effects of commercial blast-freezing on the viability of third-stage larvae of Anisakis simplex encapsulated in the muscle and viscera of sockeye salmon (Oncorhynchus nerka) and canary rockfish (Sebastes pinniger). Parallel tests were conducted on larval nematodes in 16 whole (round) salmon, 16 dressed salmon (heads and viscera removed), and 32 whole (round) rockfish. After blast-freezing, 4 in-the-round salmon, 4 dressed salmon, and 8 in-the-round rockfish were examined at 1, 24, 48, and 72 hr. A total of 3,539 dead and 6 live larvae were collected from the fish tissues after standard enzymatic digestion. Salmon were infected with 1,245 of these larvae, and rockfish with 2,300. The 6 live worms, 2 from salmon and 4 from rockfish rounds, were recovered from muscle 1 hr after freezing; they were slightly motile and showed severe internal damage. No viable worms were found at or after 24 hr. The commercial blast-freezing process effectively killed larval nematodes in whole or dressed fish. Market-ready samples of previously blast-frozen silver salmon (O. kisutch) and chum salmon (O. keta) fillets and chum salmon steaks yielded no live worms, thereby confirming the efficacy of this process.

Page Thumbnails

  • Thumbnail: Page 
600
    600
  • Thumbnail: Page 
601
    601
  • Thumbnail: Page 
602
    602
  • Thumbnail: Page 
603
    603