Alberto Akama

Learn More SCIENCE T he world’s most biodiverse river basins—the Amazon, Congo, and Mekong—are experiencing an unprecedented boom in construction of hydropower dams. These projects address important energy needs, but advocates often overestimate economic benefits and underestimate far-reaching effects on biodiversity and critically important fisheries.(More)
The weakly electric fish from the main channel of the Amazon river, Sternarchogiton nattereri, offers a striking case of morphological variation. Females and most males are toothless, or present only few minute teeth on the mandible, whereas some males exhibit exaggerated, spike-like teeth that project externally from the snout and chin. Androgens are known(More)
The gross morphology of the gas bladder is described and illustrated for representatives of most species and all valid genera of the Auchenipteridae (Siluriformes). Although, a simple cordiform gas bladder is present in some species of the family, others are characterized by their distinctive gas-bladder shape and diverticula disposition. An acute posterior(More)
  • Soraia B.A. Fonteles, Carlos E. Lopes, +6 authors Lurdes Foresti de Almeida-Toledo
  • 2008
A karyotype analysis of the electric eel, Electrophorus electricus (Teleostei, Gymnotiformes), a strongly electric fish from northern South America, is presented. Two female specimens were analyzed, one from the Amazon River and one from the Araguaia River. The specimens had a chromosomal number of 2n = 52 (42M-SM + 10A). C-bands were present in a(More)
The adult West African on intravenous fluid therapy requires 130 mmol of sodium, 50 mmol of potassium and 3L of water daily. At least 100g of glucose is usually provided. Three liters of Badoe's Maintenance Solution which contains 43.3 mmol of sodium of sodium, 16 mmol of potassium, 0.65 mmol of calcium, 9 mmol of bicarbonate, 51.7 mmol of chloride and 100g(More)
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