PLODNOST I DUŽINSKO MASENI ODNOS MATIČNOG JATA POTOČNE PASTRMKE (SALMO TRUTTA M. FARIO) IZ GAJENIH USLOVA REGIJE BANJA LUKA
Sažetak
Istraživanje plodnosti i dužinsko masenog odnosa matičnog jata gajene potočne pastrmke (Salmo trutta m. fario) realizovano je u salmonidnim mrestilištima Klašnik i Šiprage, region Banja Luka. Cilj rada bio je da se utvrdi plodnost ženki i dužinsko-maseni odnos ženki i mužjaka potočne pastrmke iz dva salmonidna mrestilišta u regiji Banja Luka. Analizirano je 30 ženki i 30 mužjaka po mrestilištu. Starost ženki u mrestilištu Klašnik bila je 3+– 4+, a mužjaka 1+ godinu i mrestilištu Šiprage ženke i mužjaci su bili starosti 4+– 6+ godina. Uzorci ikre od svake ženke fotografisani su i korišćenjem programa "ImageJ" utvrđen je broj i dijametar ikre u uzorku. Utvrđena je značajna korelacija (p < 0,01) mase, totalne dužine, standardne dužine i visine tijela ženki i mužjaka iz dva mrestilišta. Apsolutna plodnost značajno je niža kod ženki iz mrestilišta Klašnik (2589±650,85 ikre) od ženki iz mrestilišta Šiprage (4618±1541,54 ikre) koje su bile veće mase tijela. Nije utvrđena značajna razlika (p > 0,05) relativne plodnosti, mase i dijametra ikre ženki iz mrestilišta Klašnik (2220±583,71 ikre/kg; 0,097±0,014 g/ikra i 5,176±0,232 mm/ikra) i Šiprage (2343±801,65 ikre/kg; 0,095±0,02 g/ikra i 5,267±0,457 mm/ikra). Kod ženki iz mrestilišta Šiprage utvrđen je pozitivan alometrijski rast (b > 3), a u ostalim slučajevima negativan alometrijski rast (b < 3).
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