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Equations describing changes of shape along the flatfish body length and their importance for sustainable and responsible fisheries

100%

Balejko J. , Miler K. , Nowakowski P.

nr 2

Background. The purpose of this study was to identify mathematical equations describing changes in a flatfish body shape along its longitudinal axis. The initial function for the description of a cross-section contour is the ellipse equation including a factor deforming the symmetry with respect to one of axes. Such equations may find their use in fisheries engineering and food-fish processing. Materials and Methods. The morphometric examination of the fish raw material was carried out in order to check whether the proposed function meets expectations and draws a curve. The model fish species used was flounder, Platichthys flesus (L.). Results. The mathematical equation describing changes in a cross-section contour of flatfish body shape along its longitudinal axis. The high value of correlation coefficients (r > 0.99) showed that a hypothetical curve matches experiment results quite well. The equation describing the shape of a flatfish body cross-section contour can be defined by means of the ellipse equation including a factor deforming the symmetry with regard to one of its axes. The function represented by equation (8) draws a curve that follows the contour of the fish cross-section. Conclusion. The shape of flounder, defined in the presently reported study may have importance for sustainable and responsible fisheries, helping to design more selective fishing gear. It can also be used in food-fish engineering for designing more effective fish-processing machinery.

Growth, sex structure and commercial significance of turbot [Scophthalmus maximus L.] in the Lithuanian EEZ

80%

Stankus S.

nr 1

Prosorhynchoides rioplatensis [Szidat, 1970] comb.nov. [Digenea, Bucephalidae] from Catathyridium jenynsii [ Gunther, 1862] [Pleuronectiformes, Achiridae] in Argentina

80%

Lunaschi L. I.

tom 48

nr 2

A study of type material of Bucephalopsis rioplatensis Szidat, 1970 from intestine of the flatfish, Catathyridium jenynsii (Günther, 1862) (as Achirus trichospilus Berg, 1895) from the Rio de la Plata, Buenos Aires Province, Argentina, revealed that the ranges and morphological variations originally reported by Szidat (1970) and ascribed to age of specimens, appear to be caused by pressure during fixation; although some of the variation reported may have been a result of difference in age. This study redescribes the species and placed it in the genus Prosorhynchoides Dollfus, 1929 as P. rioplatensis (Szidat, 1970) comb. nov.

Spatial and temporal distribution of flounder fished in the Southern Baltic. Analysis of the catch records from Polish cutter logbooks

80%

Draganik B. , Psuty-Lipska I.

nr 3