4/3/2023 0 Comments Circuli fish![]() ![]() ![]() ![]() The morphological features and ultrastructure of teleost scales were studied by many authors In an attempt to discover new characteristics for scales that may be useful in fish taxonomy ( Mekkawy, 1980 Khalil et al., 1982 Lippitsch, 1993 Mekkawy et al., 1999, 2003, 2006, 2011 Jawad, 2005 Jawad and Al-Jufaili, 2007 Mahmoud et al., 2005 Harabawy et al., 2007, 2012 Reza et al., 2009 Matondo et al., 2010 Esmaeili and Gholami, 2011 Dapar et al., 2012 Ganzon et al., 2012). Scale characteristics have been considered relevant for fish identification, taxonomy and phylogeny especially with great developments of Scanning Electron Microscopy that had facilitated the application of scale microstructures to systematic ( Mekkawy et al., 2011 Harabawy et al., 2012). From taxonomical points of view, the Red Sea at Saudi Arabia seems to be one of the least studied areas dealing with Sparidae. Its members are carnivorous, marine, brackish, reef-associated and inhabit shallow coastal waters mainly aroreefs at depth ranged from 2-20 m ( Riede, 2004 Sommer et al., 1996). The family Sparidae (order perciformes) represents one of the most important fish families in the Red Sea. Moreover, the form of the lateral line canal, the relative position of their anterior and posterior openings and the cantilevered anterior extension of the canal were valid in differentiation between species. The scale characters included the overall form of the scales and their morphometrics, radii counts, shape of interradial tongues, the first circuli, form of interradial circuli and their denticles, the outer lateral and inner lateral circuli and the form of their denticles, granulation of the caudal field and the shape of ctenii. A wide spectrum of size-free intraspecific variations between different body regions was recorded in each species in terms of morphometric indices. The valid useful scale characters for systematic purposes were determined in the term of morphometry and Scanning Electron Microscopic techniques. The present work aimed to screening and documenting the diversity of scale characteristics of two species belonging to two different genera of the family Sparidae: Acanthopagrus bifasciatus and Rhabdosargus sarba from the Red Sea. ![]()
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