Se presenta un análisis de las especies de moluscos del arrecife coralino de Tenacatita, Jalisco en elPacífico central mexicano. El estudio incluye especies encontradas tanto en la estructura arrecifal como en los fondosblandos circundantes y en la zona intermareal rocosa. La lista sistemática está integrada por moluscos pertenecientesa las clases Gasteropoda, Bivalvia, Polyplacophora y Cephalopoda, de las que fueron encontradas un total de 123especies contenidas en 48 familias, entre las que destacan como las más representativas: Calyptraeidae, Thaididae,Columbellidae, Conidae, Arcidae, Pteridae, Chamidae e Ischnochitonidae. Se presenta una serie de observacionesecológicas sobre las especies más frecuentes, así como su afinidad por los diversos tipos de hábitat en el arrecife.Se realiza una síntesis de todas aquellas especies que han tenido algún cambio en su nomenclatura ocurrida en losúltimos 40 años. De acuerdo con una revisión de la literatura publicada, se encontró que las especies aquí listadasestán dentro de su ámbito geográfico conocido; sin embargo, constituyen registros nuevos para el área de estudio.Por último, se realiza un análisis comparativo entre la riqueza de especies del arrecife de Tenacatita y la registradaen otras localidades de la costa del Pacífico con y sin presencia de arrecifes coralinos.

A preliminary assessment of growth performance and yield of subadult Pacific red snapper Lutjanus peru raised in floating sea cages was conducted by measuring fish length, weight, feed conversion, and survival rate during a 120‐d grow‐out trial at Punta el Caballo Beach, Nayarit State, Mexico. Nine floating cages (12.5‐m³ capacity) were used as experimental units. Fish were stocked in triplicate treatment cages at 30, 50, and 70 fish/m³ (1.9, 3.3, and 4.4 kg/m³, respectively) using more than 5,600 wild subadults (mean initial weight ±SD = 63.9 ± 1.4 g) as initial fish stock. Fish were fed twice per day with a sinking commercial pellet, and dissolved oxygen, temperature, pH, transparency, and ammonia nitrogen in each cage were recorded weekly. After 120 d, the mean individual weight at harvest was inversely related to stocking density. Mean final weight, weight gain, and specific growth rate differed among groups, with the highest values recorded for the 30‐fish/m³ density (233.4 ± 5.3 g [mean ± SD], 1.4 g/d, and 1.1% per day, respectively). Mean final body length, feed conversion, condition index, and survival did not differ among density treatments. Net yield (mean ± SD) ranged from 5.0 ± 0.2 kg/m³ (30‐fish/m³ treatment) to 7.9 ± 0.3 kg/m³ (70‐fish/m³ treatment) and differed among the treatments. Considering the initial biomass and density, the 70‐fish/m³ treatment produced a higher total biomass (mean ± SD = 152.9 ± 2.4 kg) but a lower average weight than the 50‐ and 30‐fish/m³ treatments. Our findings suggest that at all stocking densities tested, subadult Pacific red snapper will grow in floating sea cages without significant mortalities. A benefit–cost analysis must be achieved to define the best treatment in economic terms.

The super-intensive white shrimp system is more productive (t ha⁻¹) than traditional systems. However, it implies greater investment in infrastructure and machinery, a continuous supply of electricity, and a specialized workforce. Therefore, the sustainability of a shrimp farm model operating in a super-intensive system in Nayarit (Mexico) was evaluated using financial analysis and life cycle assessment. The investment is important, but the fixed costs (16%) are much lower than variable costs (84%). The super-intensive farm is economically viable, with an overall profitability (29%) that is higher than that of other agri-food activities in Mexico. It is also an activity that generates a lot of employment, in relative terms, as well as economic movement in the area. The potential environmental impacts are higher than those registered in semi-intensive shrimp systems but slightly lower than those registered in intensive systems. The estimated global warming value per kg of shrimp is 5.08 kg CO₂-eq, an intermediate value. Also, as the shrimp production is much higher than in traditional systems, it could have a great and positive impact on the maintenance and regeneration of the mangrove ecosystem.