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  • 1
    Electronic Resource
    Electronic Resource
    Interception and dispersal of artificial food falls by scavenging fishes in the abyssal Northeast Atlantic: early-season observations prior to annual deposition of phytodetritus (1997)
    Springer
    Marine biology 128 (1997), S. 329-336 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The hypothesis that the behaviour of deep-sea scavenging fishes is influenced by seasonal input of organic matter from the ocean surface was investigated by observing responses to baits placed on the sea floor at 4800 m depth in the NE Atlantic (48°50′N; 16°30′W) during spring (April 1994). Data from the present study are compared with those from previous studies of the same location made in summer 1989. The first fishes to arrive at baits were the grenadier Coryphaenoides (Nematonurus) armatus and the eel Histiobranchus bathybius, after delays of 28 and 29 min, respectively; these results are not significantly different from those of summer 1989. Similarly, other indices of activity (staying time and swimming speed) showed no evidence of differences between years/seasons. However, the rate of radial dispersal of bait (0.009 m s−1) by C. (N.) armatus was much slower than in all previous studies. A change in the size distribution of C. (N.) armatus to smaller individuals in spring 1994 was also evident. It is suggested that the fish on the abyssal plain may not comprise a steady-state population and that major episodic or seasonal migrations may occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050098
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acoustic tracking of the dispersal of organic matter by scavenging fishes in the deep-sea (1998)
    Springer
    Hydrobiologia 371-372 (1998), S. 181-186 
    Details
    ISSN: 1573-5117
    Keywords: deep sea ; Coryphaenoides (Nematonurus) armatus ; transponder ; food-fall ; behaviour ; teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Movements of the scavenging deep-sea fish Coryphaenoides (Nematonurus) armatus were tracked at depths of 2500–4800 m on the Porcupine Abyssal Plain and Porcupine Seabight in the NE Atlantic using the Aberdeen University Deep Ocean Submersible (AUDOS). The AUDOS was deployed with mackerel bait and three coded acoustic transponders (CATs) covered in mackerel flesh and each enclosed in a nylon bag. Time lapse photographs allowed identification of fish ingesting CATs and estimation of fish arrival times and staying times at the bait. The radial swimming speeds recorded were much slower than inferred in previous studies using older designs of tracking equipment. It was found that C.(N.) armatus moved away from the bait source at an average rate of 1.05 m min-1 and separated from one another at an average rate of 1.32 m min-1 indicating solitary independent movement with no evidence of shoaling aggregation. The average time delay before food falls were intercepted by C.(N.) armatus in the study area was 26 min, the mean fish staying time was 115 min and the swimming time required to disperse the bait to background organic carbon density in the benthos was 46 min. Thus total time for food-fall dispersal after arrival on the sea floor was approximately 3 h.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017083107914
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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