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Absolutna in relativna plodnost, masa iker ter vpliv mase iker na maso larv in zarodka pri kalifornijski postrvi (Onchorynchus mykiss) v prvi in drugi drsti = Absolute and relative fecundity, egg weight and influence of egg weight on body weight of larve and alevins in rainbow trout (Onchorynchus mykiss) at first and second spawningPohar, Jurij, 1951-2020Od kalifornijskih postrvi iste plemenske jate smo pridobili ikre v prvi in drugi drsti. Za vsako samico smo pri vsaki od drsti določili maso telesa (MPlm) ter absolutno plodnost (PAbs). Na podlagi ... teh podatkov smo izračunali relativno plodnost (PRel). Od vsake plemenke smo individualno stehtali 50 iker v fazi iker z očmi, ter tri vzorce po 50 potomcev v različnih fazah rasti. Potomce smo tehtali 11 dni po izvalitvi (T1), nato pa še 6 tednov (T2) ter 10 tednov po izvalitvi (T3). Na ta način smo dobili podatke o povprečni masi iker (MIker) ter podatke o masah potomcev pri tehtanju T1, T2 in T3 (MRib1, MRib2 in MRib3). Na podlagi teh podatkov smo s statističnim modelom parcialne regresije, ki je kot neodvisni spremenljivki vključeval relativno plodnost in povprečno maso iker, ocenili vpliv MIker na MRib1, MRib2 in MRib3. Rezultati kažejo, da se iz težjih iker izvalijo teje larve. Vpliv MIker je relativno kratek, saj parcialni regresijski koeficient MIker na MRib3 ni statistično značilen ne pri ikrah iz prve ne pri ikrah iz druge drsti. Rezultati kažejo, da je za produkcijo smiselno uporabljati tudi ikre iz prvi drsti, čeprav so majhne. Deset tednov po izvalitvi se povprečna masa rib, izvaljenih iz majhnih iker, pridobljenih pri prvi drsti, ne razlikuje bistveno od povprečne mase rib, izvaljenih iz večjih iker, pridobljenih v drugi drsti.Source: Acta agriculturae Slovenica. - ISSN 1581-9175 (Letn. 88, št. 1, 2006, str. 3-10)Type of material - article, component partPublish date - 2006Language - slovenianCOBISS.SI-ID - 1925256
Author
Pohar, Jurij, 1951-2020
Topics
akvakultura |
ribe |
postrvi |
kalifornijska postrv |
Onchorynchus mykiss |
reprodukcija |
ikre |
larve |
masa |
aquaculture |
fish |
trouts |
rainbow trout |
Onchynchus mykiss |
reproduction |
eggs |
size |
larvae |
mass
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Pohar, Jurij, 1951-2020 | 06832 |
Source: Personal bibliographies
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