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Otolith phenotypic analysis for the endemic Anatolian fish species, Caucasian bleak Alburnus escherichii Steindachner, 1897 (Teleostei, Leuciscidae), from Selevir Reservoir, Akarçay Basin, Turkey

Ozpicak Melek, Saygin Semra, Yilmaz Savas, Polat Nazmi

Oceanological and Hydrobiological Studies

2021

Vol. 50, No. 4

430--440

Otolith phenotypic variability was analyzed in the Caucasian bleak (Alburnus escherichii) from the Selevir Reservoir in Turkey. Utricular (lapillus) and lagenar (asteriscus) otoliths were removed, while distinguishing between left and right otoliths. All otoliths were photographed on the distal (for asterisci) and dorsal surface (for lapilli) using a Leica DF295 digital camera. Otolith morphometrics were measured to the nearest 0.001 mm using Leica Imaging Software. Linear and nonlinear (power) models were applied to determine the relationships between otolith measurements and total length of fish individuals. Two length classes (Class I: 6.7–10.9 cm Lt; Class II: 11.0–15.0 cm Lt) were established to analyze the shape of otoliths. The Form Factor, Circularity, Roundness, Rectangularity, Aspect Ratio and Ellipticity were used to analyze the shape of otoliths. A standardized model was used to remove the effect of size on otolith measurements. Multivariate analysis was performed to detect differences in otolith shape variation. The results of discriminant function analysis showed that 79.9% of A. escherichii specimens were correctly classified by length classes. In this study, intraspecific variation of asteriscus and lapillus otoliths in A. escherichii is reported for the first time. The results of this study provide the first comprehensive data on otolith shape analysis and the relationship between otolith morphometrics and total length in the Caucasian bleak.

Pomiar wielkości geometrycznych ogórków z wykorzystaniem komputerowej analizy obrazu

Zapotoczny P.

Problemy Inżynierii Rolniczej

2002

R. 10, nr 4

57-64

Zaproponowano stanowisko do pomiarów wielkości geometrycznej ogórków z wykorzystaniem komputerowej analizy obrazu. Została opracowana metodyka wyodrębniania obrazu z tła. Obliczono błąd pomiaru wielkości geometrycznych. Przeprowadzono pomiary zmiany wielkości geometrycznych ogórków szklarniowych. Zdjęcia wykonywane były na 27 ogórkach przez 18 dni ich przechowywania.

Measuring presented the testing stand to measure geometrical parameters of cucumber fruits using computer image analysis. The procedure of separating image from the background was developed. Measuring arror for geometrical quantities was calculated. Changes on geometrical parameters of glasshouse cucumber fruits were measured. The image of 27 cucumber fruits were analysed during 18 days of their storage.