The specie Acetes marinus Omori, 1975, have full use as food constituting themselves into a kind of nutritional importance to the regional population, however, it is few studied. To contribute to a better use of this resource were conducted monthly collections of A. marinus during the months of January 2006 to June 2007, in two beaches, near of the Cametá town in low Tocantins river. They were certain the composition centesimal (%) and the content of cholesterol (mg/100g) relating to environmental parameters: pH, temperature and material in suspension of the subsurface water. The characterization of ovarian development, were based on the macro-and microscopic changes. For these two beaches the annual average pH was 7.52 ± 0.71, the temperature was 26.57 ° C ± 1.26, and the material in suspension was 73mg / L ± 65.53. For the composition centesimal of A. marinus got itself: 87.1% ± 1.1- moisture; 9.8% ± 1.3-ash, 71% ± 1.8-protein, 5.4% ± 2.9-lipids; 13.7 % ± 2,6- carbohydrates; 387.6% ± 13.2 kcal - calorific value. The content of cholesterol was 374.87 mg/100g ± 207.08. Was revealed a large potential nutrition, especially protein, for this species, but it is rich in cholesterol. And for developing ovarian were described three stages of maturation, based on four different types of oocytes.
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