High genetic differentiation in the edible cannonball jellyfish (Cnidaria: Scyphozoa: Stomolophus spp.) from the Gulf of California, Mexico

Analysis of the Gulf of California cannonball jellyfish fishery as a complex system

Pigments are present in a broad variety of terrestrial and aquatic organisms. The cannonball jellyfish (Stomolophus sp. 2) is an important fishery resource in the northwest of Mexico and is processed to be traded and consumed as seafood. During the process, water with a soluble blue pigment and other compounds are discarded to the environment. In this work, we present some properties of the blue pigment from Stomolophus sp.2 (S2bp), to decide if it could be considered as a potential value-added waste and avoid the blue proteinaceous pigment wastewater. S2bp was purified to homogeneity and had a molecular mass of 28.0 kDa; this protein exhibited a ʎmax at 650 nm, contained Zn2+ and Cu2+ metal ions, and was stable from 10 to 50 °C and in a pH range of 3.0 to 13.0 for 1 h. It had halotolerant characteristics maintaining the blue coloration in a broad range of ionic strength (0–4 M NaCl) and showed changes in ʎmax with chaotropic salts. In addition, S2bp was stable in the presence of organic acids and EDTA and in zwitterionic, anionic, and nonionic detergents at critical micellar concentration. However, oxidant reagents like NaClO and H2O2 decrease the coloration. These results show that the jellyfish pigment is a stable protein which makes it an alternative pigment for the food industry.

Characterization of cannonball jellyfish (Stomolophus sp. 2) blue protein: a pH-stable pigment.

The race for jellyfish: Winners and losers in Mexico’s Gulf of California

espanolEl objetivo de esta investigacion fue conocer el rol de los actores involucrados en la pesqueria de medusa bola de canon, en Guaymas, Sonora. Con el metodo bola de nieve se realizaron entrevistas semiestructuradas, luego se jerarquizaron mediante la red de poder/ interes de cuatro cuadrantes, y se relacionaron con una matriz de vinculacion. El resultado arrojo que el Instituto Nacional de Pesca, los compradores, procesadores, comercializadores y las cooperativas pesqueras son los actores clave, con mayor interes e influencia en el manejo de la pesqueria. El presente analisis es util para establecer y mejorar el manejo de la captura de medusa. Se concluye que existe una relacion conflictiva y de poca cooperacion entre los actores mencionados, lo cual impide que se respeten las estrategias de manejo para explotar la medusa en condiciones de sustentabilidad. EnglishThe aim of this research was to know the role of stakeholders involved in the cannonball jellyfish fishery in Guaymas, Sonora. Using the snowball method, semi-structured interviews were conducted, then hierarchized through the power / interest network of four quadrants, and related to a connection matrix. The result showed that the National Fishery Institute, buyers, processors, marketers and fishing cooperatives are the key players, with greater interest and influence in the management of the fishery. This analysis is useful to establish and enhance the management of jellyfish catch. It follows that there is a conflictive relationship and little cooperation among the said stakeholders, which prevents management strategies to exploit jellyfish fishing in conditions of sustainability from being respected.

/pdf/analisis-de-actores-de-la-pesqueria-de-medusa-en-guaymas-mncur3wks3.pdf

Miguel Ángel Cisneros-Mata

Papers

Análisis de actores de la pesquería de medusa en Guaymas, Sonora