The present work is a review of the literature on the native Mexican fish Dormitator latifrons. The aim is to contribute to the integration and systematization of current knowledge to make it easier to identify existing knowledge gaps and breakthroghs Moreover, promote the successful cultivation and protection of this species whose consumption is increasing in Latin America. A review of the articles related to D. latifrons published in international and regional databases was carried out. The articles reviewed focus on taxonomy and systematics, phylogenetic, geographic distribution, ecology, physiology, reproduction, development, pathology, health, and the technologies used to cultivate this fish species. The conclusion is that, even though the cultivation of D. latifrons is of commercial interest in some countries, there are still significant gaps in our knowledge of biology and, consequently, the domestication potential of the species. Filling these gaps will require systematic research efforts on protecting natural populations and improving mass cultivation techniques.

Two different experiments with rainbow trout fry were carried out to evaluate the effect of different grape pomace (GP) levels in feed on growth performance and apparent digestibility. The first experiment used 0, 20, 40, and 60 g kg −1 GP (D0, D2, D4, and D6, respectively); the second experiment used 0, 60, 120, and 180 g kg −1 GP (D0, D6, D12, and D18, respectively). Total polyphenols in the diet ranged from 0 to 8.19 mg g −1 in D0-D18. At the end of the first and second experiments (83 days and 77 days, respectively), no significant differences in fish growth were observed between the different diets.On the other hand, feed containing up to 2.7 mg g −1 total polyphenols (D6) showed a significantly higher digestibility relative to feed with more than 5.5 mg g −1 total polyphenols (D12). Our findings suggest that the inclusion of GP at levels of up to 18% in feed for Oncorhynchus mykiss fry did not affect growth parameters. However, it did influence apparent digestibility; fry that consumed diet D6 showed benefits in terms of nutrient digestibility and feed conversion efficiency. K E Y W O R D S apparent digestibility, feed, grape pomace, polyphenols, rainbow trout

RESUMEN. Dormitator latifrons es un pez con potencial comercial que habita ambientes con climas tropicales y subtropicales desde el sur de California (EEUU) hasta Perú. El objetivo fue determinar los requerimientos nutricionales de proteína y lípidos para el crecimiento de juveniles, se elaboraron cuatro dietas experimentales con contenidos de proteína del 30 y 40%, y lípidos del 8 y 16%, con tres repeticiones por tratamiento. Se realizó el análisis proximal de las dietas experimentales, del músculo al inicio y al nal del experimento y se determinó la digestibilidad aparente. No se detectaron diferencias signicativas (p > 0.05) en el crecimiento, supervivencia y la composición proximal del músculo de los peces. La digestibilidad aparente de la dieta con 30% de proteína y 8% de lípidos fue signicativamente superior al resto de las dietas, por lo que se considera suciente para un adecuado crecimiento de juveniles de D. latifrons.ABSTRACT. Dormitator latifrons is a sh with commercial potential that inhabits environments with tropical and subtropical climates from southern California (USA) to Peru. The objective was to determine the nutritional requirements of protein and lipids for the growth of juveniles; four experimental diets were prepared with protein contents of 30 and 40%, and lipids of 8 and 16%, with three repetitions per treatment. Proximal analysis of the experimental diets, of the muscle at the beginning and at the end of the experiment, was carried out and the apparent digestibility was determined. No signicant dierences (p > 0.05) were detected in the growth, survival and proximal composition of the sh muscle. The apparent digestibility of the diet with 30% protein and 8% lipids was signicantly higher than the rest of the diets, so it is considered sucient for adequate growth of D. latifrons juveniles.

Groups of Dormitator latifrons in triplicate (4.1 ± 2.0 g and 6.2 ± 1.0 cm) were fed experimental diets containing four levels of substitution of fishmeal (FM) by soybean meal (SM) (0, 40, 70, and 100%, respectively). The diets were formulated to be isoproteic (35% crude protein) and isolipidic (8.0% crude lipids). The effect of each treatment on growth was evaluated and its implications on the cost of feeding. After 60 days of feeding, there were no significant differences in the fish's proximate composition (P < 0.05). There were no significant differences between the diets (P < 0.05) in the evaluated biological indices: total growth increase (TGI), specific growth rate (SGR), thermal growth coefficient (TGC), and survival (%). Feeding costs decreased significantly as the proportion of soybean meal in the diet increased. The results indicated that substituting FM by up to 100% of SM can promote adequate growth in D. latifrons without affecting body composition and survival while also reducing operative costs during the fattening process.