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Rate and efficiency of yolk utilization in developing eggs of the soleSolea solea
Rate und Quote der Dotterausnutzung bei sich entwickelnden Eiern der SeezungeSolea solea
Helgoländer wissenschaftliche Meeresuntersuchungen volume 18, pages 53–60 (1968)
Kurzfassung
Wie bei anderen planktisch-marinen Fischen sind die Eier der Seezunge durch einen relativ hohen Wassergehalt (91%) und einen niedrigen Kaloriengehalt (5800 cal/g trockene organische Substanz) charakterisiert; demgegenüber haben die Eier der Substratlaicher einen niedrigeren Wassergehalt (etwa 75%) und einen höheren Kaloriengehalt (6500 cal/g trockene organische Substanz). Seezungenlarven scheiden kurz vor und nach dem Schlüpfen Schleim aus, wenn sie in destilliertes Wasser überführt werden. Diese Schleimabsonderung stört die Bestimmung des Trockengewichts und des Kaloriengehalts. Sie kann reduziert werden, wenn man die Larven vor Überführung in destilliertes Wasser mit Formalin abtötet. Die Ausnutzungsquote des Dotters frischgeschlüpfter Larven beträgt im Mittel 85,2% bei 10°C, 79,0% bei 15°C und 75,5% bei 20°C. Die Inkubationsdauer beläuft sich auf etwa 176 Stunden bei 10°C, 80 Stunden bei 15°C und 53 Stunden bei 20°C.
Summary
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1.
The eggs ofSolea solea, like many other marine planktonic fish eggs, are characterized by a high water content (91%) and a relatively low calorific content (5800 cal/g dry organic substance). Demersal fish eggs, on the other hand, have, according to the information available from literature, a low water content (about 75%) and a high calorific content (6500 cal/g dry organic substance).
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2.
Older embryos and freshly hatched larvae ofSolea solea secrete large quantities of slime upon brief exposure to distilled water; this makes the estimation of their dry weight and calorific content difficult. Slime secretion could be reduced to a certain extent by killing the larvae in 5% sea-water formalin prior to distilled water exposure (to remove adhering salt water).
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3.
At 10° C, incubation lasts 176 hours and freshly hatched larvae contain 85.2% of the energy contained in a freshly laid egg (0.49 cal/egg); at 15° C and 20° C, the corresponding values are 80 hours, 79.0% and 53 hours, 75.5%, respectively.
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Flüchter, J., Pandian, T.J. Rate and efficiency of yolk utilization in developing eggs of the soleSolea solea . Helgolander Wiss. Meeresunters 18, 53–60 (1968). https://doi.org/10.1007/BF01611665
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DOI: https://doi.org/10.1007/BF01611665