Roberto Mendoza

... 373 ROBERTO MENDOZA, CARLOS AGUILERA ... alimen-ticio de los lepisosteidos, el cual consiste en per-manecer inmóviles en la superficie del agua hasta que la presa se encuentra a su alcance y con un movimiento lateral de la cabeza atraparla súbita-mente ...

Mendoza, R., C. Aguilera y J. Montemayor. 2000. Utilización de subproductos avícolas en las dietas para organismos acuáticos. pp 398-439 En: Civera-Cerecedo, R., Pérez-Estrada, CJ, Ricque-Marie, D. y Cruz-Suárez, LE (Eds.) Avances en Nutrición Acuícola IV. Memorias ...

... Silva • Francisco J. García de León • David Lazcano Villarreal • Maricela Martínez Jiménez • María Esther Meave del Castillo • Rodrigo A. Medellín • Edna Naranjo García • María Teresa Olivera Carrasco • Mayra Pérez Sandi • Gabino Rodríguez Almaraz • Guillermo Salgado ...

This paper describes the strategy utilized for the domestication of the alligator gar (Atractosteus spatula), highlighting different aspects of larval development and the weaning of larvae onto artificial diets. Developmental stages based on nutritional characteristics were established. Lecithotrophic stage was observed between 1–4 days after hatching (DAH) larvae, lecithoexotrophic stage between 5–8 DAH larvae and the exotrophic stage initiates in 9 DAH larvae. The degree of development for alligator gar larvae could be differentiated by snout length. In addition, pigmentation could be easily used to separate individuals in poor condition. Growth rate of alligator gar larvae was 1.55 mm/day during the first 10 DAH and 5.6 mm/day thereafter until 15 DAH. RIA analyses showed that T3 levels are low during embryonic development, but increase after hatching, until 10 DAH, decreasing thereafter. The effect of thyroidian hormones and goitrogens on larval development was evaluated. Snout l...

When an exotic species becomes invasive, the consequences are generally negative; however, some positive effects are also possible. In this paper we explore the consequences of the introduction of fish from the Loricariidae family (loricariids) in Mexico. We analyze these effects in three areas: fishing activities, natural capital and the aquarium trade. The results of our analysis indicate that loricariids have negative effects on natural capital and on fishing activities, but positive effects on the aquarium trade—specifically the generation of profits. In summary, the impact from the introduction of loricariids translates into losses of nearly US $16.5 million annually.

The nutritional efficiency of the semi moist product "Squid Custard" was evaluated as a supplement and/or nutritional complement for larvae of the prawn Macrobrachium rosenbergii, from the V life stage onwards. The feed was prepared with fresh squid and chicken egg (38.8% crude protein and 16.4% total lipids) as protein sources. Three experimental diets with three replicates were tested in a completely random design with a density of 50 larvae/L (2500 larvae/experimental unit). The treatments were: A1: recently hatched Artemia sp nauplii; A2: 50% Artemia sp nauplii and 50% squid custard; A3: only squid custard. The larvae were fed twice daily (8:00 and 14:00). The experimental system consisted of nine circular plastic tanks (62 L), in an open culture system with a salinity of 14 ± 2 g L–1, a temperature of 29 ± 0.5 °C and a photoperiod of 12:12 L:D. The first postlarvae were observed after 23 d of culture in the A2 treatment, while in treatments A1 and A3 they were observe...

... e ROBERTO MENDOZA 1, SALVADOR CONTRERAS 2, CARLOS RAMÍREZ 1, PATRICIA KOLEFF 3, PORFIRIO ÁLVAREZ 4 Y VERÓNICA AGUILAR 3 ... tilapia (Oreochromis mossambicus, O. au-reus, Tilapia rendalli y T. zillii) y cua-tro de carpas (Cyprinus carpio var ...

Mexico owns a vast range of water related resources linked to aquatic environments that contribute significantly to commercial activities and there is a concern about the potential impact related to the introduction of invasive alien species (IAS) to these areas. The National Strategy on Invasive Species was published in 2010 establishing the guidelines that should be followed by diverse stakeholders to deal with IAS, however the collective effort to follow-up on the goals and achievements of this national strategy is just now being seen. Nevertheless the existing regulation can be easily adapted to include invasive species and that would facilitate the implementation of the National Strategy. Most national regulations are aimed towards prevention and, methodologically, there are options that can be used and adapted, for example, to include pathogens and parasites linked to IAS. Research and capacity building are accentuated in the current legal framework. In addition, there are sev...

Resumen Las poblaciones de anfibios y reptiles en numerosos ecosistemas Mexicanos están actualmente en un estado alto de deterioro. Hay varias razones para explicar esta disminución dramática. Pero una que ha recibido poca atención por parte de los científicos nacionales y esta pobremente documentada es la introducción de especies exóticas (particularmente aquellas que toleran los cambios constantes). Muchas de ellas son explotadas con fines comerciales (comida, ornamentación, investigación ect). En años recientes se ha incrementado el comercio de mascotas en México, fuera de la capital, expandiéndose a todas las ciudades grandes del país. Cualquier especies vendida como mascota es una fuerte candidata en convertirse en una especie invasiva potencial en áreas que son ecológicamente similares. En la actualidad no existe un estudio extensivo sobre anfibios y reptiles invasivos en México, con excepción del estudio con Lithobates catesbeianus (American bullfrog) introducido para su expl...

This chapter documents the rise and fall of the tilapia fishing industry at the Infiernillo Reservoir in the states of Michoacán and Guerrero, Mexico. Initially, tilapia and carp were introduced into the reservoir to provide economic opportunities for the surrounding communities. Although the carp and the native catfish were more highly valued in the reservoir, the tilapia thrived. In its hey day, this reservoir was the most productive freshwater reservoir in Latin America, supporting over 3,500 fishermen, as well as the associated processing and distributing industries. The exotic tilapia species were the source of economic opportunities for the local communities that surpassed earlier agricultural activities in terms of revenue potential. However, inadequate fisheries management, including the harvesting of juveniles prior to reproductive maturity and over-fishing, pollution, and a general failure to regulate and enforce restrictions on timing and location of fishing, resulted in ...