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  • 1
    Electronic Resource
    Electronic Resource
    Changes in diet, prey size and feeding habit in Bagrus bayad, and possible interactions with B. docmac in a Nile canal (1992)
    Springer
    Environmental biology of fishes 34 (1992), S. 425-431 
    Details
    ISSN: 1573-5133
    Keywords: Freshwater catfish ; Bagrus ecology ; Predator and prey ; Trophic adaptation ; Diet overlap ; Feeding behaviour ; Interspecific interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Bagrids in Bahr Shebeen Nilotic canal depend mainly on fish, insects and shrimp as well as fish embryos for food and their stomachs included runoff materials (e.g. plant foliage, glass, black crystals, coloured gravel). B. bayad maximised its efficiency of catching prey catfish by face to face attack to avoid damage by the prey's pectoral and dorsal spines. In the size classes of 10 to 30 cm standard length, B. bayad and B. docmac show diet overlap and interact with each other especially with respect to tilapias as prey. After this length, B. docmac, aided by its relatively larger mouth, shifted to larger size of tilapias to coexist with B. bayad.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004747
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Feeding ecology of Oreochromis niloticus (Linnaeus) & Tilapia Zillii (Gervias) in a Nile canal (1987)
    Springer
    Hydrobiologia 146 (1987), S. 57-62 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fish stomachs, 1149 for Tilapia zillii and 1698 for Oreochromis niloticus, were collected from April 1984 till April 1985 from a Nile canal in the Egyptian delta. Both species showed a significant overlap of diet (Schoener's index) among individuals ranging from 12 to 17.9 cm standard length. Outside this range differences in the importance of food of animal origin occurred. Macrophytes were the main food of O. niloticus and aquatic insects of the food of T. zillii. This initial diet overlap may have contributed to irregularity in the increase of full stomachs with increasing length, and to a decline of the stomach index (SI = stomach weight × 100/fish weight) with increase in length in O. niloticus. The stomach of either species correlated significantly with water temperature, but with daily photoperiod in O. niloticus only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007577
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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