摘要:

SummaryThe forage base and the food selectivity of 0+ representatives of six abundant freshwater fish species were studied in a shallow, eutrophic Dutch lake. Most species relied on the zooplankton; the size‐selective predation in early summer was directed to the smaller copepods and in late summer to larger cladocerans and copepods than concurrently present in the lake.Daphniaspp. and cyclopoid copepods were the main zooplankton taxa for smelt, perch and pikeperch. Energetically, the large cladoceran,Leptodora kindtii, was especially important for pikeperch. Bream and roach preyed upon smaller zooplankton than the other fish species. The influence of the zooplankton predation by abundant 0+ fish was clear from a small meanDaphniasize in September; this size is to be used as an indicator in fishery management.Neomysis integer, the most important macrofauna species, was consumed by perch, pikeperch and ruffe; pikeperch was most size‐selective in this respect. The 0+ ruffe was à typically benthivorous fish. Only the 0+ pikeperch became piscivorous, especially in years when smelt was abun

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00412.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SummaryThe amount and distribution of connective tissue in the swimming muscle of cod(Gadus morhua)have been determined. By biochemical analysis, the collagen was found to make up 1,5 % of the total protein content. Measured by light microscopical morphometric analysis, the areal fraction of the connective tissue elements was found to be 3,0 % of the total muscle area. The areal fraction of myocommatal connective tissue mentioned above was found to be 2.3 %. The thickness of the endomysial sheath was calculated by morphometry based on electron microscopy, and was found to be 0.30 and 0.16 μ for red and white fibres, respectively. The areal fraction of the endomysial sheaths was 2.3 % in red muscle and 0.5% in white muscle. The endomysial sheaths make up 25% of the total connective tissue in the swimming muscles. These sheaths influence the binding properties of fish muscle products

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00413.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SummaryPopulations of the amphipod,Anisogammarus pugettensis(Dana) 1853, can be raised for several generations under laboratory conditions. Compared with the growth of another amphipod,Eogammarus confervicolusStimpson 1856,A. pugettensisgrew more rapidly to maximum biomass and reached a new generation earlier when both were grown under their optimal growth conditions.A. pugettensisgrew faster in upwelled impoundments containing epiphytic diatoms than under laboratory conditions. In fish feeding studies, the amphipodE. confervicolusis an adequate diet for salmonid growth when compared with Oregon moist pellets.

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00414.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SummaryRoach were marked by fin‐clipping (N= 15888) or tagged with Carlin‐tags (N= 1476) during their spawning migration in two tributaries to Lake Årungen, Norway, in 1980. A total of 1746 of these roach were recaptured during spawning in 1981. The recapture rate of fin‐clipped roach was significantly higher than the recapture rate of Carlin‐tagged roach, probably due to differential mortali

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00415.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SummaryEuropean catfish(Silurus glanis)fingerlings (2 to 4 g each) were tested for susceptibility to channel catfish virus (CCV). They had supported CCV replication at 2 days after intraperitoneal injection with 0.1 ml of saline containing 105TCID50. Homogenized visceral organs (liver, kidney and spleen) contained 104TCID50/0.1 ml at 2 days post inoculation (PI) but at 4 days the titer decreased to 101TCID50. Bathing European catfish in CCV yielded only one positive sample with à titer of 100.83TCID50per 0.1 ml of tissue. No clinical signs of CCV developed and no virus related deaths occurred

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00416.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SummaryPike fry weighing 0.2 g were infected with five pathogenic viruses via the water and then fed to one‐year‐old, 60 g pike. A transer of the viruses from the prey to the predator was demonstrated. The VHS virus produced typical hermorrhages in the muscle of the second nost.ZusammenfassungZyklische Virusinfektion beim Hecht(Esox luciusL.)Auf dem Wasserweg mit fünf fischpathogenen Viren infizierte Hechtbrut (0,2 g) diente einjährigen Hechten (60 g) als Nahrungsquelle und gewährleistete hierdurch den Virustransfer. Das VHS‐Virus induzierte im 2. Wirt typische Hämorrhagien in der Muskulatur.RésuméCycles d'infection viraie chez le brocket(Esox luciusL.)Des embryons du brochet (0,2 g) inficés par l'eau servaient comme nourriture pour des brochets agés un an (60 g). Par cela le transfer du virus était verifié. Le virus VHS causait dans l'hôte seconde des hemorrhages typiques

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00417.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

SummaryMurine monoclonal antibodies against Vibrio anguillarum serotype I und IIFour stabil hybridoma cell lines against theVibrio anguillarumstrain 820/15/8 Kopenhagen—a typical serotype I strain—were raised.Three hybridoma cell lines producing monoclonal antibodies against theVibrio anguillarumstrain 134/82/1 Kiel (Serotype II) were established.The specifity of the antibodies was screened by ELISA. Monoclonal antibodies reacted with the characteristic determinant of the respective serotype o

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00418.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Book reviewed in this article:Fisheries science: The view from Lowestoft. Reviews of three books by D. H. Cushing By D. Pauly

ISSN:0175-8659    

DOI:10.1111/j.1439-0426.1985.tb00419.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY