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  • 1
    Electronic Resource
    Electronic Resource
    Species-specific attraction of migratory banded kokopu juveniles to adult pheromones (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Juvenile migratory Galaxias fasciatus juveniles or whitebait were attracted to odours produced by adults. The attraction was dependent on concentration with an upstream movement and attraction to the odour chamber at intermediate level concentrations. At a high concentration the migratory response of whitebait was retarded with the majority of fish not moving upstream but remaining in the lower section of the apparatus. There was no response to odours from adults of other galaxiid species, the inanga G. maculatus or koaro G. brevipinnis at any concentration. These results demonstrate G. fasciatus whitebait have the ability to discriminate species-specific pheromones during their migratory phase, providing evidence of a pheromonal attraction in migratory amphidromous fish which could possibly provide a basis for effective habitat selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb02281.x
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence of a rheotactic component in the odour search behaviour of freshwater eels (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 62 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The detection of food odour by the freshwater eels, Anguilla australis and Anguilla dieffenbachii released a behavioural response to flow that resulted in direct upstream movement toward the odour source. Changes in various orientation parameters were observed as eels neared the source. Eels had substantially lower swimming velocities and considerably more variable heading and course angles close to the odour source (≤0·9 m) than further away (〉0·9 m). Observed changes in orientation parameters were primarily due to changes in the behaviour of a searcher following odour loss. Cross-stream movements were initiated when the eel moved beyond the lateral margins of the odour plume. The behavioural switch from odour-conditioned rheotaxis to cross-stream casting following odour loss occurred more frequently close to the odour source where the plume was most narrow. Odour-conditioned rheotaxis enables the searcher to move quickly and efficiently toward the odour source without the need to extract directional information from a highly intermittent and complex chemical signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00015.x
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  • 3
    Electronic Resource
    Electronic Resource
    The sensory basis of rheotaxis in the blind Mexican cave fish, Astyanax fasciatus (1999)
    Springer
    Journal of comparative physiology 184 (1999), S. 519-527 
    Details
    ISSN: 1432-1351
    Keywords: Key words Lateral line ; Rheotaxis ; Olfactory ; Cave fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The sensory basis of rheotaxis (orientation to currents) was investigated in the blind Mexican cave fish, Astyanax fasciatus. An unconditioned rheotactic response to uniform velocity flows was exhibited, with a threshold of less than 3 cm s−1. Disabling the entire lateral line or the superficial neuromast receptor class increased the rheotactic threshold to greater than 9 cm s−1. A pharmacological block of the lateral line canal system alone had no effect. These results demonstrate that the superficial lateral line system controls rheotaxis at low current velocities. The effect of pairing an odor stimulant with the water current dropped the rheotactic threshold to less than 0.4 cm s−1. This study provides a clear behavioral role for the superficial neuromasts where none previously existed, and also establishes a link between the mechanosensory lateral line and olfactory systems in the olfactory search behavior of the cave fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050351
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  • 4
    Electronic Resource
    Electronic Resource
    Stretch receptors in the eye muscles of a teleost fish (1980)
    Springer
    Cellular and molecular life sciences 36 (1980), S. 1176-1177 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Extraocular muscles of a teleost fish,Girella tricuspidata, contain a predominantly phasic stretch receptor, which consists of fine beaded nerve terminals within the red portion of the muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01976111
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  • 5
    Electronic Resource
    Electronic Resource
    Rate-compensated synaptic events in antarctic fish: Consequences of homeoviscous cold-adaptation (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 806-808 
    Details
    ISSN: 1420-9071
    Keywords: Antarctic fish ; synaptic currents ; decay rates ; cold adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary At ambient sub-zero temperatures, muscles from antarctic fish produce spontaneous postsynaptic currents (MEPCs) of significantly shorter duration than those of temperate fishes. Fast decay of antarctic MEPCs is a predictable consequence of the increased membrane fluidity attributable to fatty acid unsaturation in cold-adapted animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01941530
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  • 6
    Electronic Resource
    Electronic Resource
    Limitations on visual food-location in the planktivorous antarctic fishPagothenia borchgrevinki (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 395-397 
    Details
    ISSN: 1420-9071
    Keywords: Antarctic fish ; vision ; lateral line ; prey detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The visual threshold for food-location in the antarctic fishPagothenia borchgrevinki, is compared with light conditions and food availability under the ice. Even under the most favourable conditions for vision,P. borchgrevinki is operating close to its visual threshold and must often depend on non-visual mechanisms of prey detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01957492
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  • 7
    Electronic Resource
    Electronic Resource
    A vestibulo-ocular reflex with no head movement (1986)
    Springer
    Biological cybernetics 55 (1986), S. 1-4 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Eye movements were produced in an elasmobranch preparation by electrical stimulation of the horizontal canal ampullary nerves. A pseudorandom binary sequence of stimulus pulse trains was delivered bilaterally. Eye position during this stimulus was cross-correlated with the stimulus pattern to obtain a linear model of the response. Sums of exponential functions were fitted to the crosscorrelogram data to estimate time-constants and transfer functions. The data was examined in the frequency domain by using Fourier transformation. The response is accurately described by a second order linear filter, which is essentially a low pass filter with a cutoff at 0.22 Hz. This nearly two octaves below the cutoff frequency of the eye motor plant, which has been estimated by the same method. Our data shows that there is no central phase compensation or prediction which might offset the substantial delay in eye motor plant response. We hypothesise that the necessary phase compensation may be achieved by driving the vestibulo-ocular reflex with sensory neurons having a phase advance at high frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363972
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  • 8
    Electronic Resource
    Electronic Resource
    Brain function in antarctic fish: frequency response analysis of central vestibular units (1990)
    Springer
    Journal of comparative physiology 166 (1990), S. 407-410 
    Details
    ISSN: 1432-1351
    Keywords: Pagothenia borchgrevinki ; Head rotation ; Vestibular function ; Goldfish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Extracellular single-unit recordings were made from central vestibular units responding to horizontal head rotation in antarctic fish (Pagothenia borchgrevinki) at temperatures below 0 °C. The frequency of head rotation was varied between 0.05–16 Hz and the results were analysed in terms of the phase and gain of the response with respect to the stimulus. The model of the peripheral vestibular system derived by Hartmann and Klinke (1980) was fitted to the data from antarctic fish in order to obtain a quantitative comparison of vestibular function at two different temperatures. Despite the 20 °C temperature difference, and the different recording sites (primary afferents in the goldfish, and central vestibular units in the antarctic fish) vestibular function in antarctic fish is comparable to that previously reported in goldfish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204814
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  • 9
    Electronic Resource
    Electronic Resource
    Elasmobranch eye motor dynamics characterised using pseudorandom stimulus (1986)
    Springer
    Journal of comparative physiology 158 (1986), S. 723-728 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. A pseudorandom binary sequence electrical pulse rate stimulus was delivered to the abducens nerve of an elasmobranch preparation. Ipsilateral eye movements were recorded using a position-sensitive photodiode to measure the position of a reflective patch attached to the fish's eye. 2. Eye position data was cross-correlated with the stimulus pattern, and exponential decay curves were fitted to the cross-correlograms to estimate the time constant of a linear first order low-pass filter model. The cross-correlograms were transformed into the frequency domain using a Digital Fourier Transform, and Bode plots of eye dynamics were plotted. 3. Eye motor plant dynamics in the elasmobranchCephaloscyllium isabella can be accurately characterised by a linear first order low-pass filter model with a corner frequency of 0.73±0.10 Hz. Non-minimum phase lag reaches 90
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00603830
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  • 10
    Electronic Resource
    Electronic Resource
    Ontogeny of vision in the Antarctic fish Pagothenia borchgrevinki (Nototheniidae) (1990)
    Springer
    Polar biology 10 (1990), S. 419-422 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Pagothenia borchgrevinki ranging in size from 63 to 245 mm were captured from beneath sea ice in McMurdo Sound by fishing and diver collection. Changes in ocular morphology with increasing body size were measured, and assessed in relation to ingested prey. Relative eye size was highest among smaller fish (〈100mm total length), and declined with increasing fish size. This was accompanied by a decrease in cone density in the retina from a maximum of 14,200 mm−2 in the smallest fish examined (63 mm), to 1000 mm−2 in a 220 mm long fish. Theoretical acuity was lowest among fish at either end of the size range examined (minimum separable angle 40–50′) but approximately constant over the remainder of the size range (25–40′). Rod density also decreased with increasing body size but rod numbers per unit visual arc were relatively constant, except in the smallest fish, where angular rod density was low. The same prey taxa occurred in fish of all sizes; however, prey items smaller than about 1.5 mm were not taken by fish of any body size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233689
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