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Text File | 1994-09-29 | 5.7 KB | 97 lines | [TEXT/ttxt]

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TI        SPAWNING SEASON AND MICROHABITAT USE BY CALIFORNIA GOLDEN TROUT
          (ONCORHYNCHUS MYKISS AGUABONITA) IN THE SOUTHERN SIERRA NEVADA
AU        STEFFERUD J A (Reprint).
SO        CALIFORNIA FISH AND GAME, 1993 FAL, v79, n4 p.133-144
AB        Spawning of California golden trout (Oncorhynchus mykiss aguabonita)
          was observed during May and June 1981, in Cottonwood and Mulkey
          creeks in the southern Sierra Nevada, California. Spawning began when
          daily water temperatures consistently exceeded 10-degrees-C, and was
          most intense between 1300 and 1600 h when water temperature was 16 to
          18-degrees-C. Apparent election of redd site was based on water
          velocity and size of substrate, but not on water depth or distance to
          cover. Water velocity over redds was between 25 and 77 cm/s (mean 49
          cm/s), and substrate in redds was gravel 2.0 to 19 mm in diameter.
          Golden trout constructed redds in water 4 to 24 cm deep. Redds
          averaged 0.22 m2 in surface area, and were within one-fourth of the
          stream width from the stream bank. Distance to cover from a redd
          often exceeded 15 m.
GA        PD133

2
TI        A COMPARISON OF PATHOLOGICAL CHANGES CAUSED BY VIBRIO ANGUILLARUM AND
          ITS EXTRACELLULAR PRODUCTS IN RAINBOW TROUT (ONCORHYNCHUS MYKISS)
AU        LAMAS J (Reprint).  SANTOS Y.  BRUNO D.  TORANZO A E.  ANADON R.
SO        FISH PATHOLOGY, 1994 JUN, v29, n2 p.79-89
AB        Some hematological parameters and histopathological changes in the
          liver, spleen, kidney, gills, gut, skin, muscle and heart of rainbow
          trout (Oncorhynchus mykiss) injected intraperitoneally with virulent
          Vibrio anguillarum or with V. anguillarum extracellular products
          (ECPs) were compared.
          The number of circulating red blood cells, the hematocrit and
          hemoglobin values decreased in the fish injected with either bacteria
          or ECPs compared with controls. The erythrocyte sedimentation rate
          increased in both groups of injected fish; however, the serum protein
          levels were similar to those observed in control fish.
          Light and electron microscopic observations of samples obtained from
          fish injected with V. anguillarum cells or its ECPs revealed similar
          histopathological changes in most tissues. Both groups of fish showed
          degeneration and necrosis of hepatocytes, vasodilation of the
          glomerular capillaries, cloudy swelling and hyaline droplet
          degeneration of the epithelial tubular cells, edematous gills,
          desquamation of the intestinal mucosa and necrosis of the muscle
          fibers at the site of injection. However, the bacterium multiplied
          extensively in the kidney and spleen where it caused more acute
          alterations than ECPs.
          Based on these results, it was concluded that the extracellular
          products play an important role in the virulence mechanisms of V.
          anguillarum.
GA        PD145

3
TI        EXPERIMENTAL TREATMENT WITH INCREASED TEMPERATURE OF JUVENILE COHO
          SALMON WITH EIBS
AU        TANAKA M (Reprint).  OKAMOTO N.  SUZUKI M.  IGARASHI Y.
          TAKAHASHI K.  ROHOVEC J S.
SO        FISH PATHOLOGY, 1994 JUN, v29, n2 p.91-94
AB        Experimental treatment by increasing temperature from 10-degrees-C to
          16-degrees-C was carried out on juvenile coho salmon (Oncorhynchus
          kisutch) naturally infected with erythrocytic inclusion body syndrome
          (EIBS).
          Cumulative mortality of control fish kept at 10-degrees-C throughout
          the experimental period of 40 days was 57%. In contrast, that of
          experimental fish kept at 16-degrees-C for the first 23 days and then
          at 10-degrees-C for 17 days was 10%. The longer the period at which
          the fish were kept at the higher temperature (16-degrees-C), the
          lower the mortality. Experimental challenge with EIBS to the
          survivors of the temperature-increasing treatment revealed an
          increase in the resistance to reinfection of EIBS.
GA        PD145

4
TI        A STUDY ON SEROTYPING OF CYTOPHAGA PSYCHROPHILA ISOLATED FROM FISHES
          IN JAPAN
AU        WAKABAYASHI H (Reprint).  TOYAMA T.  IIDA T.
SO        FISH PATHOLOGY, 1994 JUN, v29, n2 p.101-104
AB        The serological characteristics of the strains of Cytophaga
          psychrophila isolated from different fishes in different areas were
          compared by the microtiter method. Included were 3 strains from cobo
          salmon (Oncorhynchus kisutch) in Miyagi Prefecture, 4 from rainbow
          trout (Oncorhynchus mykiss) in Nagano and Tokyo Pref., 6 from ayu
          (Plecoglossus altivelis) in Tokushima and Wakayama Pref. In addition
          to these Japanese strains, 3 strains from coho salmon in USA were
          used as references. Three antisera were prepared with the type strain
          NCMB1947 from coho salmon in USA, FPC828 from coho salmon in Miyagi,
          and FPC840 from ayu in Tokushima. In the comparison of C.
          psychrophila strains by using these antisera, all were positively
          agglutinated by each of the antisera, indicating the presence of
          common antigen(s). On the basis of the absorption analysis with
          thermostable antigens, two distinct serotypes (O-1 and O-2) were
          recognized. The strains from coho salmon in Japan and USA belonged to
          serotype O-1. Serotype O-2 occurred only in Japan, and was
          distributed among rainbow trout as well as ayu.
GA        PD145