O presente trabalho teve como objetivo obter dados quantitativos sobre as classes de lipídios presentes no filé de curimatã, Prochilodus cearensis. Os lipídios totais (LT) foram fracionados em classes de lipídios neutros (LN), gliceroglicolipídios (GL) e glicerofosfolipídios (PL) através de cromatografia em coluna aberta de sílica gel 60 (70-230 mesh). As análises foram realizadas em quatro lotes de amostras contendo cada uma três exemplares, adquiridos em feiras livres de Fortaleza-CE, nos meses de março, maio, junho e julho de 1998. Os LT representaram em média 3,8% em relação ao peso fresco da amostra. A classe lipídica dominante foi de LN com média de 75,1% dos LT ou 2,9g/100g de filé. Os GL e PL contribuíram em média com 1,6% (61mg/100g de filé) e 23,3% (885mg/100g de filé), respectivamente. A composição química centesimal apresentou média de 76,3% de umidade, 18,6% de proteína total e 1,3% de cinza. | The purpose of this work is to quantify lipid classes founded in fillets of "curimatã", Prochilodus cearensis. Four lots of samples, each one containing three specimens, were obtained from retail stores in Fortaleza (Ceará State - Brazil) on March, May, June and July 1998. The total lipids (TL) were fractionated by open column chromatography in neutral lipids (NL), glyceroglycolipids (GL) and glycerophospholipid (PL). The TL was averaged in 3.8% of muscle, on wet mass basis. The dominant lipid class was NL averaging at 75.1% in relation to the TL or 2.9g/100g of fillet. The GL and PL contribution in average with 1.6% (61mg/100g of fillet) and 23.3% (885mg/100g of fillet) of the TL, respectively. The approximate composition had average of 76.3% moisture, 18.6% protein, and 1.3% ash.

This study was conducted to elucidate the effects of rearing conditions on the composition of different phospholipid (PLs) classes and triacylglycerols (TAG) of the thick-lipped grey mullet (Chelon labrosus), a muscle originating from seawater and geothermal water. The major fatty acids in the examined lipid classes of the two fish groups were palmitic acid (C16:0), stearic acid (C18:0), oleic acid (C18:1n-9), linoleic acid (C18:2n-6), arachidonic acid (C20:4n-6), eicosapentaenoic acid (C20:5n-3), and docosahexaenoic acid (C22:6n-3). The analyses demonstrated that the fatty acid profiles of the PL classes in the seawater fish group were characterized by the predominance of n-3 polyunsaturated fatty acids (PUFA). By contrast, in geothermal fish, the distribution of PUFA series proportions differed between the phospholipid fractions. It was found PUFA n-3 was particularly abundant in PS and PI, while the n-6 series dominated the PC and PE PUFA group. Nonetheless, it was found that neutral lipid fatty acids were characterized by saturated fatty acids (SFA) followed by monounsaturated fatty acids (MUFA) in the seawater fish and by PUFA in the geothermal fish. The results presented here give useful information on the role of lipid classes in the physiological adaptation of C. labrosus which can serve for the optiminzation of these aquaculture systems. | Este estudio se llevó a cabo para dilucidar los efectos de las condiciones de cría sobre la composición de diferentes clases de fosfolípidos (PL) y triacilgliceroles (TAG) del músculo de salmonetes de labios gruesos (Chelon labrosus) procedentes de agua de mar y de agua geotérmica. Los principales ácidos grasos en las clases de lípidos examinados de los dos grupos de peces fueron, palmítico (C16:0), esteárico (C18:0), oleico (C18:1n-9), linoleico (C18:2n-6), araquidónico (C20:4n-6), eicosapentaenoico (C20:5n-3) y ácido docosahexaenoico (C22:6n-3). Las determinaciones mostraron que los perfiles de ácidos grasos de los PL, en el grupo de peces de agua de mar, se caracterizaron por el predominio de ácidos grasos poliinsaturados n-3 (PUFA). Por el contrario, en los peces geotérmicos, la distribución de las proporciones de las series de PUFA difirió entre las fracciones de fosfolípidos. Se encontró que los PUFA n-3 eran particularmente abundantes en PS y PI, mientras que la serie n-6 dominaba el grupo de PUFA PC y PE. No obstante, se encontró que en lipidos neutros, los mayoritarios son los ácidos grasos saturados (SFA) seguidos de los ácidos grasos monoinsaturados (MUFA) en el pescado de agua de mar y los PUFA en el pescado geotérmico. Los resultados actuales brindan información útil sobre el papel de las clases de lípidos en la adaptación fisiológica de C. labrosus que puede servir para la optimización de estos sistemas de acuicultura.