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  • Articles  (575)
  • Other Sources
  • Blackwell Publishing Ltd  (310)
  • Wiley-Blackwell  (265)
  • 2020-2022
  • 1970-1974  (575)
  • 1970  (575)
  • Biology  (575)
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  • Articles  (575)
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  • 2020-2022
  • 1970-1974  (575)
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  • 1
    Electronic Resource
    Electronic Resource
    Population changes within a group of fish species in Lake Tanganyika following their exploitation (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Pelagic fish populations in Lake Tanganyika consist mainly of two small clupeid species and four centroponiid species which prey on them. Exploitation with purse-seines began in the southeast arm in 1962 and catches were sampled up to early 1969. Inshore clupeid populations were also sampled with a scoop-net (lusenga of the kind used in the traditional inshore fishery.Clupeid biomass reached annual maxima around September. One clupeid species, Stolothrissa tanganicae Regan, dominated pelagic catches except in 2 years when about equal quantities of the other clupeid, Limnothrissa miodon Blgr. were caught. Numbers of each predator (three species of Lates and Luciolates stappersii Blgr.) decreased from 1963 to 1966 and remained low thereafter. The clupeid catch rose from 1964 to 1967 and remained high in 1968. The average nightly catch weight per year of all species together altered relatively little. Changes in population size distributions occurred.Sampling methods were concluded to be valid for clupeid populations, but probably indi-cated only general changes in predator populations. Clupeid life-cycles are mostly accomplished within a year, and appear closely related to the periodic and spatial variations in plankton production. The two species are competitive and can replace one another in the pelagic zone. Certain distribution patterns of the clupeids and of the predator young are believed to be adaptations to severe predation. Low replacement rates under fishing pressure account for the decline of predator species, and the clupeid increase resulted from reduction in predation. A fairly stable exploited phase has apparently been reached in which clupeid biomass is much greater and predator biomass much less than in the natural state. The data encourage certain predictions. Similar major trends occurred in the much larger fishery in the Burundi sector of the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03292.x
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on ulcerative dermal necrosis of salmonids (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The gross pathology and histopathology of a series of 150 cases of UDN disease of salmon Safmo sulur L. from a number of Scottish rivers is described. The lesions appeared first as small grey areas on the heads of affected fish, which gradually enlarged in size, ulcerated and became infected with fungus of the Saprolegniu group. Histologically, the earliest lesion was an acantholysis of the suprabasal cells of the epidermis developing into transient bullae which rapidly sloughed to produce a raggcd irregular epiderm's. Once the base-ment membrane was breached secondary infection by fungi rapidly ensued.The histopathology, in the early stages, was consistent with possible viral infection, or anoxic atrophy but it was considered that the most similar lesion from mammalian experi-ence, was that of the Pemphigus group of dermatoses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03295.x
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  • 3
    Electronic Resource
    Electronic Resource
    The status of the burbot Lota lota (L.) (Gadidae) in Britain (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Records of burbot Lota lota (L.) captures from the early nineteenth century to the present have been gathered and arranged watershed by watershed in chronological order. Most are from eastward-flowing river systems from Durham southwards to the Great Ouse, but a few records from westward-flowing systems are considered. In many areas the records imply a decline of burbot numbers and distribution during the present century, though burbot may never have been more than locally abundant. Local over-fishing, pollution and habitat changes are considered the most likely causes of decline. Conservation measures seem desirable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03277.x
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  • 4
    Electronic Resource
    Electronic Resource
    The development of a saccus vasculosus in Tilapia mossambica Peters and other cichlids (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Observations are made on the development and the presence of a Saccus Vasculosus in Tilapia mossambica and other cichlids.In those cichlids that do not possess a saccus vasculosus the development of this organ is apparently suppressed in a very early stage of life.A saccus vasculosus is present in all those American and Indian cichlids that were investigated, but this organ was not found in cichlids indigenous to the African continent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03282.x
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  • 5
    Electronic Resource
    Electronic Resource
    Biology of the emerald shiner Notropis atherinoides Rafinesque in Lake Simcoe, Canada (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The study of the emerald shiner Notropis atherinoides Rafinesque was conducted in 1967 and 1968 in Lake Simcoe, a eutrophic inland lake with an area of 725 km2 situated in the Province of Ontario, Canada. On the basis of meristic characters, the emerald shiner of Lake Simcoe conforms to the classical description of the species and is not distinct from the form inhabiting the Great Lakes. Annulus formation occurred in early June on age I fish but second and third annuli were not formed on older fish until late July through August.Young-of-the-year emerald shiners reached a total length of 45 mm by October; age I were 81 mm and age II measured 92 mm by the same month. By September, age I female emerald shiners attained a size superiority of 5 mm over males of that age group and by the end of the third summer age II females exceeded age II males by 8 mm. Spawning occurred offshore in the latter part of July when surface water temperatures approximated 20°C. Of the three age groups, age II specimens were the most prevalent on the spawning grounds. Average absolute fecundity was 3410 eggs in fish of all age classes combined. Differences in water temperature seem to strongly influence the seasonal distribution pattern of the emerald shiner. The final temperature preferendum of the species, as determined in a vertical temperature gradient tank, was 25°C. The emerald shiner is extensively utilized as a bait fish by anglers and appears to be an important forage fish. The plasticity of the species to adapt to a variety of ecological conditions and the species potential for high production favour its introduction to waters requiring a good converter in the food chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03284.x
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  • 6
    Electronic Resource
    Electronic Resource
    Observations on the biology of the giant goby Gobius Cobitis Pallas (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The biology of the giant goby,Gobius cobitisPallas, from a rocky shore in Brittany is described. The fish inhabits tidepools on the upper part of the shore and feeds mainly on algae and Crustacea. It attains an age of at least 10 years and grows to about 230 mm in total length. Breeding occurs in spring and early summer and females spawn twice each season. Fecundity varies from approximately 2 to 12,000 and is dependent upon size. The food and growth is briefly compared with that of a Mediterranean population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03286.x
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  • 7
    Electronic Resource
    Electronic Resource
    The fatty acids of some marine teleosts (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The lipids of five mesopelagic species of myctophid, two mesopelagic species of stomia-toid, and one epipelagic species of Macrorhamphosidae from the eastern-North Atlantic have been examined by thin-layer chromatography and their fatty acid compositions have been determined by gas-liquid chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03264.x
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  • 8
    Electronic Resource
    Electronic Resource
    Diel changes in invertebrate drift and the food of trout Salmo trutta L. (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Diel changes in the stomach contents of 0+, 1 + and 2+ or older trout were compared with diel changes in invertebrate drift. Peaks in mean numbers and biomass of invertebrates per fish stomach occurred in the midday (10.00 to 14.00 h) and evening (18.00 to 22.00 h) samples. The major peak was usually in the evening sample, but the major peak in biomass was in the midday sample for 2+ fish. There was a good correlation between diel changes of benthic invertebrates in the diet and drift, with the major peak in the evening. A similar relationship did not always exist for emerging and terrestrial invertebrates. Known non-drifting benthic invertebrates (e.g. large caddis larvae) were excluded from the comparisons, and were only taken by 2+ or older trout in which they contributed a large biomass to the day food.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03269.x
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  • 9
    Electronic Resource
    Electronic Resource
    BOOK REVIEWS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Book reviewed in this article:A SYSTEMATIC LIST OF THE VERTEBRATES OF IRAQ by Nuri Mahdi and P.V. Georg.STUDIES ON THE BLOOD SERUM OF THE EURYHALINE CYPRINODONT FISH FUNDULUS HETEROCLITUS, ADAPTED TO FRESH OR TO SALT WATER by G. E. Pickford, F. Blake Grant and Bruce L. Urnminger.CHEMICAL OCEANOGRAPHY edited by Rolf Lange.SYMPOSIUM ON SALMON AND TROUT IN STREAMS edited by T. G. Northcote.BIBLIOGRAPHY OF THE MONOGENETIC TREMATODE LITERATURE OF THE WORLD 1758 TO 1969 by W. J. Hargis, Jr., A. R. Lawler, R. Morales-Alarno and D. E. Zwerner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03273.x
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  • 10
    Electronic Resource
    Electronic Resource
    The relationship of gonadal development to the life cycles of the paired species of lamprey, Lampetra fluviatilis (L.) and Lampetru planeri (Bloch) (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 2 (1970), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Gonadal developnient has been studied throughout the larval period of Lumpetru fluviatitis and comparisons have been made with conditions in the larvae of the closely relatcd non-parasitic species, L. planeri. The two forms differ in the time of onset or mitotic division in germ cells and in the period when oogenesis is initiated. These phases begin in L. pluneri when the ammocoetes are one year old and in L. fluviatilis at the end of the second year. The course of sex differentiation appears to be sinlilar in both forms. While in the early stages, the oocytes of L. planeri are larger than those of L. fluviatilis. at comparable ages, by the end of the third year they are sinlifar in size in both spccics. It is suggested that in L. planeri, during the extension of the larval period, gonad growth is retarded and during this phase the ammocoete accumulates body reserves which are used to meet the metabolic requirements of the rapidly developing gonads after metamorphosis. The differences observed in early gonadogenesis are believed to account for the reduced fecundity of the L. planeri ammococtc and their adaptive significance is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1970.tb03271.x
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