caa a22 4500 477116809 CHVBK 20180405111624.0 cr unu---uuuuu 170330e19961001xx s 000 0 eng 10.1007/BF00005034 doi (NATIONALLICENCE)springer-10.1007/BF00005034 Gorodilov Yuriy Biological Institute of St. Petersburg University, Oranienbaum Chaussee 2, Stary Peterhof, 198904, St. Petersburg, Russia aut Description of the early ontogeny of the Atlantic salmon, Salmo salar , with a novel system of interval (state) identification [Elektronische Daten] [Yuriy Gorodilov] Synopsis: The sequence of morphological changes through intervals from the time of egg insemination until the time of completed yolk absorption was investigated. The studied time span was divided into more than 100 morphologically discrete states. For this purpose, some quantitative characters, such as number of cells, somite pairs, or caudal fin rays, extent of epiboly, or vascularisation, were selected as key characters, since they seem to provide the most adequate picture of the dynamic developmental process. Descriptions and drawings of 41 states (out of the more than 100) were chosen for the present study to illustrate the embryo and alevin periods. The time it takes to form one somite pair (τS) was used as the unit of relative age and duration of the early ontogenetic states. The morphological description of each state was supplemented by the estimation of the relative age of the embryo or alevin at this state as the value of N/τS, where N is the time elapsed from egg insemination up to any given state at a given constant temperature. It was determined that the developmental rate of Atlantic salmon embryos depends on the incubation temperature according to the equation: Ig Nt = Ig No + (−0.0967 + 0.00207t)t, where NO and Nt are values of τS at temperatures of 0 and t (°C), respectively, taking into account that the values of τS and the duration of the entire embryogenesis vary proportionally within the temperature range tolerated by the species. The methods used here to identify states of embryogenesis and to estimate the relative age of S. salar embryos and alevins might also be applied to other fish species. Kluwer Academic Publishers, 1996 Embryogenesis nationallicence Embryo period nationallicence Alevin period nationallicence Staging nationallicence Schedule of development nationallicence Developmental rate nationallicence Effect of temperature nationallicence Fish nationallicence Salmonidae nationallicence Environmental Biology of Fishes Kluwer Academic Publishers; http://www.wkap.nl 47/2(1996-10-01), 109-127 0378-1909 47:2<109 1996 47 10641 https://doi.org/10.1007/BF00005034 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005034 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Gorodilov Yuriy Biological Institute of St. Petersburg University, Oranienbaum Chaussee 2, Stary Peterhof, 198904, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers; http://www.wkap.nl/ 47/2(1996-10-01), 109-127 0378-1909 47:2<109 1996 47 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer