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Use of Potato Starch in Diets of Tropical Gar (Atractosteus tropicus, Gill 1863) Larvae

Laboratorio de Acuicultura Tropical, División Académica de Ciencias, Biológicas Universidad Juárez Autónoma de Tabasco, C.P. 86139 Villahermosa, Tabasco, Mexico
Centro de Investigaciones Biológicas del Noroeste, Instituto Politécnico Nacional, C.P. 23096 La Paz, Baja California Sur., Mexico
Consejo Nacional de Ciencia y Tecnología, C.P. 03940 México City, Mexico
Facultad de Ciencias Marinas, Universidad Autónoma de Baja California (UABC), C.P. 22860 Ensenada, Baja California, Mexico
Author to whom correspondence should be addressed.
Academic Editor: Francisco J. Moyano
Received: 19 December 2016 / Revised: 24 February 2017 / Accepted: 27 February 2017 / Published: 7 March 2017
(This article belongs to the Special Issue Nutritional Requirements in New Fish Species Under Culture)
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Tropical gar, Atractosteus tropicus, is a carnivorous fish species from Southern México with high value and acceptance in local markets. Therefore, the present study aims to spare proteins in diets for larviculture of this species. An experiment was performed using three different experimental diets with increasing carbohydrate levels based on potato starch (S) and decreasing protein content (P) and total energy: 16% S (16% S–44% P), 22% S (22% S–40% P) and 28% S (28% S–36% P). Tropical gar larvae (five days post-hatching, 2.1 mm average notochordal length) were assessed for growth, survival, degree of cannibalism, and digestive enzyme activities for 30 days. Highest growth and survival (24%), as well as the lowest cannibalism (33%), was seen in larvae fed the 28% S diet, and these larvae also had the highest lipase, amylase and glucosidase activities (0.28, 0.56 and 0.11 units, respectively). Protease activity (alkaline protease, trypsin, chymotrypsin, and leucine aminopeptidase) was higher in the larvae fed the 22% S diet than in those given the 16% S and 28% S diets. In conclusion, dietary inclusion of potato starch at 28% S enhanced growth, survival and some digestive enzyme activities, and decreased cannibalism in the larval gar. Potato starch could replace dietary protein as a major source of energy for A. tropicus larvae, thereby reducing the cost of diets. View Full-Text
Keywords: growth; cannibalism; digestive enzymes; fish larvae; dietary carbohydrate; protein sparing growth; cannibalism; digestive enzymes; fish larvae; dietary carbohydrate; protein sparing

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Frías-Quintana, C.A.; Álvarez-González, C.A.; Tovar-Ramírez, D.; Martínez-García, R.; Camarillo-Coop, S.; Peña, E.; Galaviz, M.A. Use of Potato Starch in Diets of Tropical Gar (Atractosteus tropicus, Gill 1863) Larvae. Fishes 2017, 2, 3.

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