Leonardo Martinez-Cardenas

• Doctor of Philosophy
• Researcher at Universidad Autónoma de Nayarit

Objective: Acute toxicity markers in zebrafish caused by exposure to treated sewage from two sewage treatment plants were evaluated in order to obtain accurate and relevant information on the potential environmental health risks associated with these waters. Design/methodology/approach: The acute toxicity assessment was performed according to the g...

Body shape is a morphological attribute that frequently changes as organisms adapt to environmental fluctuations and optimize the use of available resources. In fish whose distribution includes estuarine and riverine environments, it is common to observe changes in body shape that are related to maneuverability and speed of movement in response to...

127 “naca” fish, Dormitator maculatus from the Alvarado lagoon, were analyzed, of which 1134 microplastics (MP) were obtained: 561 found in the digestive tract and 573 in gills. The predominant MP found in D. maculatus were fibers with 97.53%, the most abundant color was blue (62%), followed by transparent (12%) and of these the MP in the form of f...

The management of effluents and their treatment is a fundamental issue in water management, the removal of different types of contaminants is another relevant issue for public health and the environment. Bacteria are one of the main types of contaminants in untreated water discharged to receiving bodies. The objective of this research was to evalua...

Objective: The growth, survival and condition factor of Ambystoma mexicanum juveniles fed with three commercial feed-based diets coated with different animal oils as potential palatability enhancers were evaluated. Methodology: Three diets were prepared using commercial feed coated with fish, chicken and krill oil. The experiment lasted 81 days, th...

The shape of the urogenital papilla is used to visually determine the sexual dimorphism of Dormitator maculatus. However, it is occasionally not possible to determine this in practice. The objective of the present study was to propose and statistically validate other morphometric measures to fulfill this same purpose. The analysis was designed on t...

Objective: To evaluate the effect of different stocking densities:12 (D12), 18 (D18) and 24 (D24) individuals m-2 (ind m-2) on growth (weight and length) and survival in juvenile river crocodiles (Crocodylus acutus). Design/methodology/approach: The crocodiles were cultured in each treatment by triplicate for 43-d in nine plastic tanks and fed a di...

Objective: To determine the protein nutritional requirements in juvenile axolotls, for this purpose, four isocaloric diets (8 % lipids) with 30, 35, 30 and 45 % protein were prepared. Design/methodology/approach: Six axolotls were used per test, during a period of 81 days. The diets were prepared using fishmeal as a protein source and fish oil as a...

The present study aimed to test the effect of three stocking densities: 100, 200, and 300 ind m-3 (D100, D200, and D300, respectively) on survival, growth (weight and total length), and condition factor of Microphis brachyurus. At the end of the six-week trial, there were no significant differences in the fish's survival, growth, and condition. The...

Objective: To determinate the attractability of four oils, fish, chicken, krill, and red crab (Pleuroncodes planipes) for Ambystoma mexicanum juveniles, evaluating their feeding behavior using a Y aquarium. Design/Methodology/Approach: Ten axolotls were used per test, fasted for 48 h. Gels with oils were prepared using gelatin and poured into petri...

The aim of this study was to determine the effect of stocking density on growth performance, survival, feeding efficiency, and size distribution of freshwater prawn M. tenellum during the nursery phase of intensive culture in a net cage-ponds system. Freshwater prawn juveniles (mean = 0.46 g ± 0.001) were cultured in 12 net cages (1 m3) within two...

Basic information about importance the cultive of Mayaheros beani.

This study examined the nutritional value of solvent-extracted canola meal (CM) as a replacement for fish meal (FM) in practical diets for spotted rose snapper (Lutjanus guttatus). Four isonitrogenous (490 g/kg crude protein), isoenergetic (19.03 kJ/g) diets containing 0 g/kg (CM0), 150 g/kg (CM150), 300 g/kg (CM300), or 450 g/kg (CM450) of CM prot...

Tropical gar (Atractosteus tropicus) is currently exploited regionally as food and commercialized in the aquarium trade. Natural populations of A. tropicus may already be negatively affected by anthropogenic alteration of the areas in which it is distributed. However, it is necessary to deepen the knowledge for the optimization of its culture. A. t...

Short-tailed pipe fish (Microphis brachyurus) is a freshwater organism with high economic potential for the aquarium hobby, so it is necessary to implement methods to promote its culture through studies of digestive physiology. General activities of acid and alkaline proteases were evaluated, as well as the effect of pH, temperature and inhibitors....

The feeding behavior and the factors that influence the ingestion rate of feed in shrimp are described. The main factors that influence the ingestion rate of food in shrimp are mainly: the selection of food, food stability, satiety, feeding frequency, density and dispersion of the food, shrimp size, molting stage, temperature, dissolved oxygen in t...

The gar, Atractosteus tropicus is a native fish distributed in fluvial systems of the Mexican southeast, which presents aquaculture potential in the food industry and as ornamental species. However, it is necessary to deepen the knowledge for the optimization of its culture. The present study examined the effect of three feeding frequencies on the...

En México, el cultivo de tilapia y de camarón ocupa un lugar dominante debido a la importancia económica que estos recursos representan. La producción y consumo de los productos pesqueros y acuícolas ha aumentado en las últimas décadas. La acuacultura ha tenido un gran desarrollo, a tal grado que en la actualidad aporta casi la mitad de la producci...

p>In the present review, we have described aspects of the color of marine shrimp of importance in aquaculture (mainly Penaeus japonicus, Litopenaeus vannamei and Penaeus monodon) and in the world. It is generally described some ecological aspects and some factors that affect the color of the shrimp. It describes in a general way, ecological aspects...

En México, Euphorbia strigosa se ha identificado como una especie con potencial ornamental, por su coloración y su porte pequeño (35 cm, se considera una versión enana de Euphorbia pulcherrima). La dificultad en la conservación de E. strigosa se encuentra en la gran variabilidad de sus semillas en función de las condiciones ambientales y genotípica...

Wild populations of the green mojarra Cichlasoma beani, are being pressured by anthropogenic activities. It is possible to mitigate the deterioration of native species populations by developing culture techniques. Environmental factors such as light intensity and photoperiod may affect the development of fish under culture conditions. Therefore, th...

This study undertakes the characterization of digestive proteases in the juvenile green cichlid, Cichlasoma beani. The results obtained showed a higher activity of alkaline proteases (0.14 ± 0.01 U mg protein⁻¹) compared to acid proteases (0.07 ± 0.01 U mg protein⁻¹) in this species. The optimum temperature of the alkaline proteases was 65 °C and t...

Seagrasses in coastal environments have been threatened by increased human activities; these have negatively altered processes and environmental services, and have decreased grassland areas. The aim of this study was to generate knowledge of Thalassia testudinum distribution, state of the structure and fragmentation level in two reefs of the Veracr...

In Tasmania, commercial seahorse culture takes place in tank systems in which approximately 75% of the water is exchanged daily from the Tamar River estuary. The aim of this study was to examine the effect on survival of early juvenile pot-bellied seahorses, Hippocampus abdominalis, directly transferred and cultured for 9 d in salinities of 5, 10,...

The San Pedro Mezquital River is the seventh largest river in Mexico, and flows through the Sierra Madre Occidental into the Marismas Nacionales Biosphere Reserve, on the coast of the state of Nayarit. The present study is to conform a systematic checklist of fishes in the lower basin of the San Pedro Mezquital River. In total, 52 species were coll...

The goal of this study was to determine the effect of the liquid extract of Yucca schidigera on water quality and survival of Pacific red snapper Lutjanus Peru during its transfer from wild to laboratory conditions. Three experimental groups (0.00; 0.25 and 0.75 mg of Y. schidigera liquid extract per liter of culture) were tested with four replicat...

Se determinó determinó el efecto de dos productos profilácticos durante un periodo de cuarentena en la sobrevivencia de Lutjanus peru en condiciones de laboratorio. Fueron comparados cuatro tratamientos, cada uno con tres replicas; se utilizaron dos productos profilácticos (Crustabay y Bioaqua), en dos concentraciones, (0.25 ppm y 0.75 ppm). Adicio...

The goal of this study was to determine the effect of the liquid extract of Yucca schidigera on water quality and survival of Pacific red snapper Lutjanus peru during its transfer from wild to laboratory conditions. Three experimental groups (0.00; 0.25 and 0.75 mg of Y. schidigera liquid extract per liter of culture) were tested with four replicat...

The development of culturing techniques has been a successful strategy to protect species. Natural populations of the opossum pipefish, Microphis brachyurus are affected in Mexico by anthropogenic alteration of their habitat and unregulated fishing as this species is traded as an aquarium fish without formal records as occurs with other syngnath...

The Mexican cichlid Cichlasoma beani is currently exploited regionally as food and can be commercialized in the aquarium trade. Natural populations of C. beani may already be negatively affected by anthropogenic alteration of the areas in which it is distributed. The aim of the present study was to examine the effect on growth, survival, and condit...

The Mexican cichlid, Cichlasoma beani has potential to be a candidate for the aquarium trade and the food industry. However, currently there are no studies regarding the effect of environmental factors on the species in culture conditions. The aim of this study was to assess the potential of C. beani to be maintained in cultured conditions. Additio...

La influencia de los factores abióticos ha sido investigada extensamente en la acuacultura para controlar variables en cultivo. Se han realizado estudios para determinar la influencia (ya sea positiva o negativa) del fotoperiodo sobre diferentes etapas del ciclo de vida de algunas especies. El fotoperiodo puede condicionar la capacidad de visualiza...

The Mexican cichlid, Cichlasoma beani has potential to be a candidate for the aquarium trade and the food industry. However, currently there are no studies regarding the effect of environmental factors on the species in culture conditions. The aim of this study was to assess the potential of C. beani to be maintained in cultured conditions. Additio...

Mexico is considered the domestication center of the tomato (Lycopersicon esculentum Mill.). However, in Mexico, research studies regarding the mineral nutrition of native tomato genotypes are scarce. Some tomato genotypes may have the potential to compete with commercial hybrids in terms of yield and quality, and can be cultivated in the greenhous...

The effect of stocking density and photoperiod on Hippocampus abdominalis was examined in this study. Stocking densities of 45, 30, 15 and 5 seahorses 3 L−1 were tested on newborns. Growth and survival were independent of stocking density. A second stocking-density experiment aimed to remove the effect of an early mortality experienced in experimen...

During a series of observations, newborn pot‐bellied seahorses, Hippocampus abdominalis, were offered three size choices of diameter and density of substrate. The seahorses exhibited a marked preference for the greatest diameter and the lowest density substrates.

The present study was conducted to assess the use of floral protectors alone or impregnated with phytohormones (gibberellins or cytokinins) to increase bud quality. The floral protectors prevented the entry of thrips to the flower bud and increased the flower bud quality in the varieties Black Magic and Polo. The floral protector alone and gibberel...

In Tasmania, Australia, commercial seahorse culture takes place in tank systems in which approximately 75% of the water is exchanged daily from the Tamar River estuary. As such, some water conditions such as temperature fluctuate on a daily and seasonal basis. The aim of this study was to examine the effect on growth, condition, survival of, and Ar...

Commercialization of cactus pears based on their antioxidant properties can generate competitive advantages, and these can turn into business opportunities and the development of new products and a high-value ingredient for the food industry. This work evaluated the antioxidant activities (1,1-diphenyl-2-picrylhydrazyl radical-scavenging, protectio...

A diel plasma melatonin profile measured in adult pot-bellied seahorses Hippocampus abdominalis showed that this species produces elevated levels of melatonin during the scotophase, returning to basal levels during the photophase.

The effect of the background (tank) colour on feeding activity, growth and survival of early juvenile seahorses Hippocampus abdominalis was investigated in two experiments. In experiment one, two sets of background colour (Set 1: Clear, white, red, blue, black; Set 2: Clear, white, yellow, orange, green) were used to quantify short-term Artemia ing...

A comparison was made of growth performance in bullfrog Rana catesbeiana tadpoles and biogenic capacity in culture tanks with gravel, sand and hard bottoms. Stage 25 (Gosner) tadpoles from a single cohort were stocked in 1-m2 fibreglass tanks at 50 m−2. Two treatments and a control were employed, with three replicates each: T1=tadpoles reared in ta...