Asimetría de masa de los otolitos del mugílido Liza klunzingeri (Day, 1888), capturados en el Golfo Pérsico junto a Bandar Abbas Se calculó la asimetría de masa, x, como la diferencia entre la masa de otolidos pareados a izquierda y derecha, dividida por la masa media. Se estudió la asimetría del otolito sacular de Liza klunzingeri. Como en otras especies de peces simétricos, el valor absoluto de x no dependió de la longitud del pez ni del ratio de crecimiento del otolito. El valor medio de x estuvo entre-0,2 y +0,2.

Caso de pigmentación anormal en el mero Epinephelus stoliczkae (Day, 1875) capturado en el golfo de Omán Se capturó un especimen de Epinephelus stoliczkae con pigmentación anormal en la costa de Mascate, golfo de Omán. En ambos lados del cuerpo se observan diferencias, en cuanto al grado de aberración cromática, así como patrones y áreas anormales. Se discuten posibles causas.

Rutkayová J., Jawad L., Nebesářová J., Beneš K., Petrášková E., Näslund J. 2016. First records of scale deformities in seven freshwater fi sh species (Actinopterygii: Percidae and Cyprinidae) collected from three ponds in the Czech Republic. Acta Ichthyol. Piscat. 46 (3): 225-238.Background. A wide range of morphological anomalies, including abnormalities in scale shape and structure, have been described from a large number of fi sh species worldwide. Quite often, such reports linked the observed abnormalities to the quality of aquatic environment. The presently reported study was initiated to explore and categorize the abnormalities found in the scales of seven freshwater fi sh species of Czech Republic: Ctenopharyngodon idella (Valenciennes, 1844); Gymnocephalus cernua (Linnaeus, 1758); Hypophthalmichthys molitrix (Valenciennes, 1844); Hypophthalmichthys nobilis (Richardson, 1845); Leuciscus idus (Linnaeus, 1758); Perca fl uviatilis Linnaeus, 1758; and Sander lucioperca (Linnaeus, 1758). The observed abnormalities are discussed in the context of contaminated aquatic environments with the intention to understand the aetiology of the abnormalities Materials and methods. Samples were collected at 3 sites (ponds) in the Czech Republic. In total, 10 200 scales were collected, cleared in 1% potassium hydroxide, and observed under a light microscope. Four variables were measured for each scale: anterior-posterior length (major axis, MAA), dorsal-ventral length (minor axis, MIA), diameter of the focus in the centre of the scale, number of radial lines (radii) starting from near focus, and the ratio of major to minor axes were calculated as a measure of scale shape. Results. The anomalous scales, 63 in total, were collected from ten different body regions in seven species studied. They exhibited different shapes and sizes: 30 scales showed severe anomalies and 33 only slight ones. Based on the MAA : MIA ratio, the majority of the scales examined had a narrow to rectangular or broad to squarish shape. Elongated scales were only obtained from H. molitrix, H. nobilis, and C. idella. There were one square-shaped and 8 rectangular-shaped scales in G. cernua, 3 and 6 in P. fl uviatilis, and 2 and 1 in S. lucioperca Conclusions. The presently reported cases of fi sh scale abnormalities should direct the future work on the relations between the state of the environment and fi sh health. Another interesting question to answer would be to determine whether or not the removal of abnormal scales would lead to replacement by either normal or abnormal scales.

Confirmed record of Monodactylus argenteus (Family Monodactylidae) from Jubail, Saudi Arabia, Arabian Gulf.-The first record of M. argenteus from the Arabian Gulf coasts of Saudi Arabia is confirmed, based on a sample measuring 158 mm in SL. Morphometric and meristic data are provided for this specimen.

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