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Shells of Bufonaria echinata as biomonitoring materials of heavy metals (Cd, Ni and Pb) pollution in the Persian Gulf: with emphasis on the annual growth sections
Get PDFConcentrations of heavy metals (Cd, Ni and Pb) were determined in soft and hard tissues (three separated shell sections) of gastropod Bufonaria echinata as well as surficial sediments collected in October 2015 from two sampling sites located in the sub-littoral zone of Qeshm Island, Persian Gulf. There were significant differences between the sampling sites for concentrations of all the three elements in the shells and sediments. But in terms of the soft tissues, in the case of Ni and Pb significant differences between the sites could be observed. In all the cases, higher levels were observed in the samples from Suza site, which may be mainly due to the proximity of this site to the relevant anthropogenic sources. Comparison of the gained data from this study with the other relevant researches shows that in most cases the levels of the elements in the soft tissues and shells either fell within the range for other world areas or were lower. The observed increasing trends of metals accumulation in the shell sections (from older to younger sections) could be mainly attributed to the gradual increase of relevant anthropogenic pollutants in the study area, especially in Suza pier, during the recent years. Generally, it can be concluded that the shells of B.echinata could be possibly employed as a biomonitoring tool for historic metals contamination in northeastern part of the Persian Gulf
Comment: Turn the tide
No full textSubsistence fisheries are an important source of nutrition, culture and welfare for communities in the Western and Central Pacific region, and ought to be protected. No other part of the world has a small population dispersed over such a vast ocean area. In the Western and Central Pacific Ocean, 11 million people live in 14 independent countries and eight territories, spread over 28 million sq km of ocean space. Their total land area is less than 2 per cent of the combined ocean area. Subsistence, coastal, artisanal, semi-industrial and industrial fisheries coexist in the region, harvesting species ranging from sedentary molluscs to shared, highly migratory tuna stocks. The fishing areas range from lagoons, reefs, shoals, archipelagic, internal and territorial waters, to the exclusive economic zone (EEZ) and the high seas
Nigeria: Fear of flight
No full textIn Nigeria, waterfront communities, whose livelihoods are predominantly dependent on fishing and related activities, live under constant fear of eviction
India: Some grains of salt
No full textIndia’s 2019 Draft National Policy on Inland Fisheries and Aquaculture is an ambitious effort but limited in depth and vision
What’s new, webby? Families in a changing world: Progress of the world’s women 2019-2020
Get PDFThis report provides an extensive and detailed guide for the factors that need to be addressed in order to achieve gender equality and women’s empowerment, in regards to the changing landscape of family norms
Network: Expanding the horizons: The 7th Global Conference on Gender in Aquaculture & Fisheries (GAF7) showcases progress towards and challenges to gender equality
Get PDFThe 7th Global Conference on Gender in Aquaculture & Fisheries (GAF7) was hosted by the Asian Institute of Technology (AIT), in Bangkok, from 18 to 21 October 2018. This was the first stand-alone event of the Gender in Aquaculture & Fisheries Section (GAF Section) of the Asian Fisheries Society (AFS), and saw 149 experts, researchers and practitioners deliberate on 95 research papers and nine special workshops. Participants came from 28 countries representing Africa, Asia, Europe, North America, Oceania, Australia, South America and the Caribbean
Modelo bayesiano de producción excedente con autocorrelación serial
Get PDFSe presenta un modelo simple de producción excedente al que se denomina Modelo de Producción Excedente con Autocorrelación Serial (MPECAS) debido a que considera como único supuesto que la producción excedente presenta correlación serial y no tiene una relación funcional explícita con la biomasa. Su aplicación se logra solo con un índice de abundancia proporcional a una potencia dada de la abundancia media real del recurso y la serie de capturas anuales correspondientes. La estimación de los parámetros del modelo se plantea en un contexto bayesiano utilizando el algoritmo SIR (Sampling Importance Resampling). Se proponen criterios de riesgo sencillos para estimar la Captura Máxima Biológicamente Aceptable (CMBA) y los riesgos asociados a cada nivel de captura hipotética considerada. Se llevó a cabo un ejercicio de simulación para evaluar la capacidad estadística del MPECAS para reproducir la información proporcionada por un modelo operacional de producción excedente de Schaefer considerado como real. Finalmente, se presenta un ejemplo de aplicación con el recurso corvina rubia (Micropogonias furnieri) y se muestran las CMBA para el 5 y 10% de riesgo de disminución de biomasa en el año siguiente al de evaluación calculadas con el modelo de Schaefer y el MPECAS
Aluterus monoceros (Acanthopterygii, tetraodontiformes) southwards distribution range extension in argentine waters
Get PDFThe presence of Aluterus monoceros (Linnaeus, 1758) in Mar del Plata, Argentina (38° S) was registered over 40 years ago. This new report extends its southernmost distribution limit to 39° S (Necochea: ~ 120 km). The presence of the species could be associated to the warm subtropical water derived from the Brazilian continental shelf. The hypothesis was tested with satellite images of the sea surface temperature recorded during the cruise the specimen was caught
Primera descripción del desarrollo larval temprano de la vieira patagónica (Zygochlamys patagonica)
Get PDFSe procedió a describir el desarrollo larval temprano de la vieira patagónica (Zygochlamys patagonica) que se obtuvo de los desoves de las temporadas de verano 2015 y 2017. Los desoves se obtuvieron por inducción con las técnicas de limpieza valvar y shock térmicos (7 y 13 °C) en 16 vieiras adultas de entre 55 y 72 mm de alto de valva, sexualmente maduras y en igual proporción de sexos. El agua de los recipientes de inducción se filtró con tamiz de 35 mm para retener los ovocitos fecundados que se colocaron en recipientes de 2 l con agua oceánica a 7 ± 0,5 °C y sin aireación. Se observaron y midieron los estadios de desarrollo temprano hasta larva trocófora y se registró la duración de cada fase y el tipo de movimiento. El desarrollo embrionario se completó con el estadio de gástrula 30-40 h posteriores a la fecundación. La fase de larva trocófora comenzó a las 80-84 h, estadio en que se produjo la mortalidad total de las larvas. Si bien no se completó el ciclo de vida de Z. patagonica, el presente trabajo constituye el primer registro de desarrollo larval temprano de la especie, necesario para conocer el tiempo que la larva pasa en la columna de agua y, por lo tanto, su capacidad de dispersión
The effects of Rosmarinus officinalis essential oil on the quality changes and fatty acids of Ctenopharyngodon idella
Get PDFThe effects of the use of essential oil of Rosmarinus officinalis on the chemical quality and fatty acids of fish fillets of Ctenopharyngodon idella were investigated during frozen storage at -18 ºC for 6 months. Fish fillets were divided into three groups; the control (C) without rosemary essential oil, the second group with 0.2 % rosemary essential oil (A) and the third with 0.4 % (v/v) rosemary essential oil (B). According to compositional analysis of the rosemary essential oil by GC-MS, the α-pinene (31.91%) and 1, 8- cineol (14.66%) were the predominant components. Results showed that there were no significant differences of protein in group C and A, but differences were seen between A and B (p0.05). Effect of rosemary essential oil showed that the least changed fatty acids were on polyunsaturated fatty acids (PUFA), monounsaturated fatty acids (MUFA) and saturated fatty acids (SFA), respectively. Microbial results showed TVC content of fillets fish did not exceed the limit during storage period for A and B Groups (< 7 log CFU g^-1 ). Rosemary essential oil at 0.2% and 0.4 % was effective in controlling the chemical compositions and fatty acids, but sensory attributes reveal a decreasing trend in the attributes like color, odour, taste, firmness and general acceptance for two groups (p<0.05), but group A indicated better scores than Group B at the end of the storage period