Josué Alonso Yee-Duarte

Autonomous University of Baja California Sur · Academic Department of Marine and Coastal Sciences

The prevalence of parasites in gonads of the clam Megapitaria squalida (Sowerby, 1835) was investigated at Santa Rosalía mining port in the Gulf of California. A total of 696 gonads were histologically analyzed, observing an unusual parasitic castration caused by the development of trematode larvae within follicles. Trematode sporocysts within foll...

Background. It is known that organisms inhabiting polluted marine habitats may experience adverse physiological effects. The port of Santa Rosalía, Gulf of California, is characterized by high concentrations of heavy metals in sediments, particularly Cu, Zn, Co, Mn, Pb, and U, which are potentially toxic to the marine biota. In addition, this port...

The gonadal health status of the chocolate clam Megapitaria squalida collected from the Santa Rosalía mining port and San Lucas beach (reference site), Gulf of California, Mexico, was assessed through histological analysis of the reproductive tissue, from which the histopathological alteration index (HAI) was determined. In addition, copper and iro...

Organisms that are chronically exposed to high concentrations of heavy metals may exhibit alterations in their biological functions. The mining port of Santa Rosalia, Gulf of California, is an area that has anomalously high concentrations of heavy metals in its marine sediments. Despite evidence of contamination and potential toxicological risk, li...

The length–weight relationships (LWRs) were estimated for 12 fish species. The species were collected monthly from the commercial catch of small‐scale fisheries using gillnets (mesh size 7.6–15.2 cm, length 200–1,000 m, 6–48 hr of operation during the day) and longlines (surface and bottom, 300 hooks, sardine bait, operation during the day) in the...

Objective: Prolonged exposure to heavy metals, such as Pb, Hg, or Cu, has multiple adverse effects on marine organisms at the cellular, physiological, and population levels. Bivalves' histopathology provides a sensitive biomarker of pollutant-induced stress and environmental health. Gonad tissue deterioration is of particular concern, as it affect...

The life cycle of Echinocephalus pseudouncinatus has not been described in detail to date, as is also the case of other species in the genus. This study contributes to the information available about the life history of the genus, particularly E. pseudouncinatus, by (1) using molecular techniques (small subunit rRNA gene [SSU rRNA] sequences) to id...

Although various studies have reported the bioaccumulation of metals in bivalves of commercial interest from the Gulf of California (GC), the risk associated with their consumption remains poorly understood. In this study, our own and bibliographic concentrations of 14 elements in 16 species of bivalves from 23 locations were used to investigate (1...

Megastraea undosa snail is part of the economically important benthic fisheries of the western coast of Baja California Sur, Mexico. Studies on their density and size structure are important because they are part of the stock assessments that support the fishery management. The objective of this work was to determine the spatial-temporal variations...

We studied the effects of chronic exposure to metals on energy reserves and reproduction in the clam Megapitaria squalida in two nearby populations exposed to different levels of pollution from mining operations in the Gulf of California, Mexico. Female M. squalida from San Lucas beach had good reproductive health status, whereas Santa Rosalia spec...

A nivel nacional, Baja California Sur ocupa el primer lugar en captura de la almeja chocolata Megapitaria squalida (68% de la captura anual promedio). A pesar de que M. squalida es considerada una especie de bajo valor comercial (entre $1.50 y $3.00 M.N por pieza o entre $40 y $80 M.N. por kilogramo de almeja sin concha), es un recurso importante p...

El pez cochito (Balistes polylepis) representa una de las pesquerías ribereñas más importantes en Baja California Sur, donde su captura se lleva a cabo durante todo el año. Sin embargo, se desconocen aspectos biológicos básicos de la especie. Los estudios de las relaciones longitud-peso y los índices morfofisiológicos en peces, proporcionan informa...

Background: It is known that organisms inhabiting polluted marine habitats may experience adverse physiological effects. The port of Santa Rosalía, Gulf of California, is characterized by high concentrations of heavy metals in sediments, particularly Cu, Zn, Co, Mn, Pb, and U, which are potentially toxic to the marine biota. In addition, this port...

The knowledge of the reproductive strategy in species of economic importance is essential for the management of natural stocks, as well as to seat bases for the development of its culture. The reproductive strategy includes a series of reproductive tactics controlled by exogenous and endogenous factors. The reproductive cycles of the marine bivalve...

From January to December, 2006 the variation of the gonadosomatic (IGS), muscle (IM), digestive gland (IGD) and mantle indices (IMA) of Nodipecten subnodosus in Bahía de Los Angeles, B.C., Mexico were analyzed. A total of 334 organisms were examined, all within an interval of 48 to 172 mm of shell height. The IGS showed a seasonal pattern indicatin...

From January to December, 2006 the variation of the gonadosomatic (IGS), muscle (IM), digestive gland (IGD) and mantle indices (IMA) of Nodipecten subnodosus in Bahía de Los Angeles, B.C., Mexico were analyzed. A total of 334 organisms were examined, all within an interval of 48 to 172 mm of shell height. The IGS showed a seasonal pattern indicatin...