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  • 1
    Electronic Resource
    Electronic Resource
    Sea-bass larvae in coastal and estuarine plankton (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 33 (1988), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1988.tb05580.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The development of the eggs and early larvae of blue whiting, Micromesistius poutassou and the effect of temperature on development (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 14 (1979), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Eggs of the blue whiting, Micromesistius poutassou were artificially fertilised and incubated at a range of temperatures; larvae were reared for 8½ days after hatching. The development of the eggs and early larvae is described and contrasted with previously published descriptions. The relationship between incubation temperature, t, and development time, dt, is described by the Bělehrádek equation dt=a(t-a)b. The rate of embryonic development increased with increasing temperature, the time from fertilisation to hatching decreasing from 205 h at 6° C to 70 h at 15° C. No eggs survived to hatch at incubation temperatures above 14·5° C while at 6·2° C and below embryonic development was still proceeding when the experiment was terminated. The optimal survival rate (about 70%) was achieved between 6° and 10° C. Lengths of larvae at hatching were between 2·29 and 3·17 mm, those incubated at the higher temperatures being at a more advanced stage of ontogenetic development. The growth rate of yolk-sac larvae declined from 10% per day immediately after hatching, to less than 1 % per day 7 days later when the yolk-sac was fully absorbed. Egg diameter varied between 0·99 mm and 1·15 mm when fresh. During development eggs were initially buoyant and later sank.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1979.tb03500.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Histological changes in starved turbot larvae (Scophthalmus maximus) quantified by digital image analysis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 44 (1994), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In turbot larvae, Scophthalmus maximus, deprived of food for 24 h there was a significant increase in the specific surface of the epithelium and the corresponding microvillous border of the foregut accompanied by slight cellular degeneration. Following 48 h starvation Sarvae showed severe tissue degeneration in the foregut mucosa, progressing to extensive mucosal desquamation and cellular sloughing. Intracellular vacuolation of the epithelium and loss of microvilli was also extensive and the ability of the gut to absorb food must be severely impaired, with further starvation probably resulting in larval death. There was no evidence of parasitic infection in any of the larvae sampled and all observed alterations are attributable to food deprivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1994.tb01203.x
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  • 4
    Electronic Resource
    Electronic Resource
    A density-gradient column for determining the specific gravity of fish eggs, with particular reference to eggs of the mackerel Scomber scombrus (1981)
    Springer
    Marine biology 63 (1981), S. 101-106 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new method is described for determining the specific gravity of fish eggs. The technique requires the preparation of a stable column of a continuously graded solution of sea-water salts such that a specimen introduced into the column settles at a level of known specific gravity, where it is in hydrostatic equilibrium with the fluid in the column. The method allows the simultaneous measurement of specific gravity of a number of specimens continuously throughout development and is suitable for use aboard a vessel at sea. Differences of specific gravity may be resolved to a precision of better than 4x10-5; as an example of use of the method, the specific gravity of eggs of the mackerel Scomber scombrus L. declined during development within the range 1.0205 to 1.0245; unfertilized eggs displayed a continuous increase of specific gravity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394667
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Dipole source localization by mottled sculpin. III. Orientation after site-specific, unilateral denervation of the lateral line system (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 335-344 
    Details
    ISSN: 1432-1351
    Keywords: Key words Lateral line ; Excitation patterns ; Sound localization ; Denervation ; Lateralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To test the hypothesis that spatial excitation patterns along the lateral-line system underlie source localization, we videotaped the orientation behavior of blinded mottled sculpin in response to a small dipole source (50-Hz vibrating sphere) before and after unilateral denervation of the lateral line system on different body regions (head, trunk and head + trunk). Approach pathways were qualitatively similar to those followed by normal intact animals. Abnormal behavior (turning in circles) was not observed. However, the frequency with which fish placed their intact side facing the source increased by 12–89%, depending on the denervation site. The angular accuracy of orientation decreased by 20° to 60° (100% to 370% change) depending on source location and region of lateral line denervated. Deficits tended to be site-specific. For example, unilaterally denervating lateral-line organs on the head resulted in less accurate orienting responses when the source was located on the denervated side of the head, but not on the opposite side of the head or on either side of the trunk. Site-specific deficits and the absence of abnormal approach pathways argue that animals are relying on a point-by-point spatial representation of source location along the sensory surface rather than computations based on bilateral comparisons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050260
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Continuous Plankton Records: A change in the plankton of the southern North Sea between 1970 and 1972 (1978)
    Springer
    Marine biology 45 (1978), S. 209-213 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Samples collected by the Continuous Plankton Recorder in the southern North Sea have revealed marked changes in the timing and season length of 6 Ceratium species and the occurrence of other plankton species between 1970 and 1972, which persisted until 1974. These changes coincided with a considerable increase in salinity at the eastern end of the English Channel and it is suggested that they reflect an increase in the flow of English Channel water into the southern North Sea. This, in turn, appears to be related to an increase in westerly winds following a change in the distribution of atmospheric pressure over the northern North Atlantic after 1970.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390603
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Suspended particulates in the Irish Sea and feeding conditions for fish larvae (1994)
    Springer
    Marine biology 118 (1994), S. 7-15 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The size distributions (2 to 160 μm equivalent spherical diameter) of suspended particulate material sampled on two cruises along a transect in the Irish Sea in 1988 are described in relation to hydrographic conditions, chlorophylla concentration and carbon to nitrogen ratios. Particulates were more abundant and larger size modes in the distribution were more evident, in the upper mixed layer of stratified water than in areas where the water column was fully mixed. The detrital content was estimated at 52% of total particulate matter above the thermocline in stratified regions and at around 97% at mixed water sites. In stratified regions the predominance of larger sized phytoplankton and lower levels of detritus is argued to support a more direct and efficient transfer of energy to fish larvae via larger sizes of copepods. Conversely, in mixed areas of high detrital loading the smaller size spectrum of particulates incorporates a less efficient transfer of energy through bacterial cycling and smaller copepods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00699214
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Carbon content and nutritional condition of sardine larvae (Sardina pilchardus) off the Atlantic coast of Spain (1999)
    Springer
    Marine biology 134 (1999), S. 367-373 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As part of a “European Sardine/Anchovy Recruitment Program” (SARP), sardine larvae (Sardina pilchardus) were sampled off the Atlantic coast of Spain through the spawning season from March to June. The larvae were analysed for carbon and nitrogen content as a measure of nutritional condition and survival potential. There was no significant diel variation in larval carbon content, but there was a small significant diel variation in nitrogen; the absence of a strong diel signal in elemental composition was ascribed to the overnight retention of the gut contents. There was an increase in carbon content with increase in body length which reached an asymptote at ∼40% carbon content at a larval length of 20 mm. It is argued that larvae with a carbon content of 〈25% of body weight were nutritionally stressed, with the smaller larvae (〈10 mm in length) appearing to be more vulnerable to food limitation. Although larvae with the lowest age-specific carbon content (poorest condition) occurred on the cruise with the lowest food availability, there was no consistent relationship between carbon content and food availability. While the successive monthly estimates of carbon content revealed differences in potential recruitment between months, these were not related to the birth-date distribution of the surviving juveniles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050553
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Modeling and measuring lateral line excitation patterns to changing dipole source locations (1996)
    Springer
    Journal of comparative physiology 178 (1996), S. 359-371 
    Details
    ISSN: 1432-1351
    Keywords: Lateral line ; Distance determination ; Receptive fields ; Excitation patterns ; Source localization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In order to determine excitation patterns to the lateral line system from a nearby 50 Hz oscillating sphere, dipole flow field equations were used to model the spatial distribution of pressures along a linear array of lateral line canal pores. Modeled predictions were then compared to pressure distributions measured for the same dipole source with a miniature hydrophone placed in a small test tank used for neurophysiological experiments. Finally, neural responses from posterior lateral line nerve fibers in the goldfish were measured in the test tank to demonstrate that modeled and measured pressure gradient patterns were encoded by the lateral line periphery. Response patterns to a 50 Hz dipole source that slowly changed location along the length of the fish included (1) peaks and valleys in spike-rate responses corresponding to changes in pressure gradient amplitudes, (2) 180° phase-shifts corresponding to reversals in the direction of the pressure gradient and (3) distance-dependent changes in the locations of peaks, valleys and 180° phase-shifts. Modeled pressure gradient patterns also predict that the number of neural amplitude peaks and phase transitions will vary as a function of neuromast orientation and axis of source oscillation. The faithful way in which the lateral line periphery encodes pressure gradient patterns has implications for how source location and distance might be encoded by excitation patterns in the CNS. Phase-shift information may be important for (1) inhibitory/excitatory sculpting of receptive fields and (2) unambiguously encoding source distance so that increases in source distance are not confused with decreases in source amplitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193974
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Continuous plankton records show fluctuations in larval fish abundance during 1948–72 (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 134-136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Counts of fish larvae from selected recorder samples are allocated to statistical rectangles of 1 latitude by 2 longitude, and the mean number of fish larvae per recorder sample per month is calculated for each rectangle. These means are then used for the analysis of variability in distribution ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/258134b0
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    Paper (German National Licenses)
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