![]() ![]() This taxonomic uncertainty affects the fishery statistics because some individuals combine multiple species as a single species, and this gives the data little analytical value with which to draw conclusions and make fisheries administrative decisions. Reports on the difficulty of proper species identification caused by the wide variation in body size and coloration are frequent in the literature, so the geographical distribution is somewhat uncertain. In a taxonomic context, the shell plasticity of ostreid species has been a troublesome matter, where some “forms” of several species have been assigned different names by several authors ( Harry 1985, Guo et al. 2011), and their protection and management require a sound biological baseline. ![]() 2019) however, oyster populations have been declining because of overfishing, habitat destruction, and diseases ( Beck et al. In addition, to fulfilling their role as primary producers within the trophic chain, oysters are ecologically a keystone in marine ecosystems, providing ecological services as filter-feeders, calcifiers, and reef-builders, and for this last reason, they are considered bioengineers ( Smaal et al. In 2017, the world oyster production was approximately 5.9 million tons, with harvest production being 97.5% of the total production, and oysters are positioned as the fourth most important seafood group globally, by volume of production, after cyprinid fish, seaweed, and clams ( FAO 2020). Their demand, consumption, and use today are mainly satisfied by aquaculture and are, thus, of utmost importance for the local fishing economies ( Sevilla-Hernández 1993). In the tropical region of the American Pacific, they are listed as commercially important species within the invertebrates ( Díaz et al. Oysters are bivalve molluscs widely distributed globally and are considered one of the most economically important and appreciated seafoods in the world. Finally, possible future actions are discussed to provide a more comprehensive knowledge of oysters from the tropics and subtropics of the American Pacific based on the conservation and use of the resources. The main diseases and some uses of oysters as bioaccumulating organisms are also described, as well as phylogenetic and population genetic studies. In the same way, a description of their populations and ecological interactions is provided, emphasizing the reproduction of the different species and ordering the description of the main stages in the gametogenic development of the populations in a latitudinal form. Aspects of their biology are described, referring to general anatomy with a type species, the Cortez oyster Crassostrea corteziensis, as well as the life cycle, taking as reference the recent studies carried out on the rock oyster Striostrea prismatica. The present review organizes the studies of a dozen species that are grouped as oysters of the tropical and subtropical American Pacific, considering their taxonomy and identification, as well as their distribution, and establishing an identification key using the characteristics of the shell. ![]() This is most evident in temperate zones, whereas studies in tropical zones have been comparatively scarce and somewhat disorganized. Today, they represent one of the most exploited natural resources, are produced by aquaculture activities, and are one of the most studied groups of shellfish. E-mail: have throughout history been one of the most important marine invertebrate animals used, whether as human food or as a cultural base. Colosio s/n, entre Reforma y Sahuaripa, Sonora 83000, Mexico 23090, MéxicoĦDepartamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Hermosillo, Av. 85506ĥCentro de Investigaciones Biológicas del Noroeste (CIBNOR), Calle I.P.N. 2.35, Estero de Bacochibampo, Guaymas, Sonora, Mexico C.P. ![]() Universidad, Cumaná 6101, VenezuelaģDepartment of Invertebrate Zoology, Santa Barbara Museum of Natural History, 2559 Puesta del Sol Road, Santa Barbara, CA 93105ĤCentro de Investigaciones Biológicas del Noroeste (CIBNOR), Unidad Sonora, Camino al Tular Km. César Lodeiros, 1,2,* Paul Valentich-Scott, 3 Jorge Chávez-Villalba, 4 José Manuel Mazón-Suástegui, 5 José Manuel Grijalva-Chon 6ġGrupo de Investigación en Biología y Cultivo de Moluscos, Escuela de Acuicultura y Pesquería Facultad de Veterinarias, Universidad Técnica de Manabí, Calle Gonzalo Loor Velasco, Bahía de Caráquez EC131459, EcuadorĢInstituto Oceanográfico de Venezuela Universidad de Oriente, Av. ![]()
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