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  • 1
    Publication Date: 2021-05-19
    Description: A partir de cinco cruceros de investigación realizados en el periodo 2008 – 2010, en dos bahías semicerradas (Buena Vista y San Juan de los Remedios), de la región norcentral de Cuba, se analizó la variabilidad espacio-temporal de la turbidez del agua y su relación con la temperatura, salinidad, concentración y saturación de oxígeno disuelto, pH, transparencia, color, sólidos suspendidos y totales, demanda química de oxigeno (DQO) y la intensidad del viento in situ. Se evaluó la calidad de las aguas por el índice del estado trófico, y de la comparación y relación transparencia vs. turbidez se obtuvieron intervalos de turbidez (FTU) que se utilizaron como indicador de la calidad de los cuerpos de aguas estudiados. La turbidez presentó relación estadística (positiva) significativa (α〈0,05) con el color del agua, los sólidos totales y la DQO, e inversa con la transparencia, el pH, y la concentración y saturación de oxígeno disuelto. En la distribución horizontal, los máximos de turbidez se localizaron en aguas cercanas a la costa coincidiendo con zonas contaminadas por materia orgánica, que según el índice del estado trófico clasificaron como mesotróficas o eutróficas. Según los intervalos de turbidez determinados en función de la transparencia, se identificó como calidad BUENA los valores menores que 5 FTU y MALA a partir de 8 FTU. Con intensidades de vientos superiores a 14 km h-1 se incrementó la turbidez a concentraciones mayores que 8 FTU, lo que limitó la visibilidad de los fondos en la región.
    Description: It was analyzed the space-time variations of turbidity and their relation with temperature, salinity, dissolved oxygen concentration and saturation, pH, water transparency and color, suspended and total solids, chemical oxygen demand (COD), and the in situ intensity of the wind in two semi-enclosed bays (Buena Vista and San Juan de los Remedios) located in the north-central region of Cuba. Measurements were taken during five cruises in different seasons of the year between 2008 and 2010. Water quality was determined by the trophic state index. Intervals of turbidity (FTU) were obtained from the relation transparency vs. turbidity, which were used as indicators of water quality in the studied water bodies. Turbidity showed a significant (α〈0,05) and direct statistic relation with water color, total solids and COD; and an inverse relation with transparency, pH and dissolved oxygen concentration. Areas of higher turbidity values coincided with near-shore zones contaminated by organic matter that classified as mesotrophic and eutrophic, according to the trophic state index. Consistent with the intervals of turbidity determined in relation to transparency, used for evaluating water quality in marine zones of fishery use in the north-central region, it was identified as GOOD the quality values lower than 5 FTU, and as BAD quality values higher than 8 FTU. With wind intensities stronger than 14 km h-1 blowing from the first quadrant, turbidity increases up to values higher than 8 FTU, limiting the visibility in the bottoms of this region.
    Description: Published
    Keywords: turbidez, ; calidad, ; bahías semicerradas, ; región norcentral,
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 24-35
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  • 2
    Publication Date: 2021-05-19
    Description: The Gulf of Batabanó (GB), is the region of the Cuban marine platform of greater extension and fishing importance. Habitat effects of marine species have been reported as a consequence of natural and anthropic factors. The objective was to determine significant spatio-temporal variations in the hydrology of GB in different periods and environmental situations. For this, the variability of rainfall and air temperature was analyzed in 1975-1995 and 1996-2015 periods of low and high cyclonic activity, the thermohaline characteristics of the GB before (1959-1970) and after (2006-2016) the river damming, and the effect of two hurricanes almost simultaneous in 2008 (“Gustav” and “Ike”). Significant differences in the interannual variability of meteorological parameters between the north and south of the GB corresponded to local characteristics, and changes occurred in the distribution of the months of maximum rainfall. The perennial impact of the damming, coupled with temporary precipitation deficits in spring, summer and winter, caused thermohaline increases in 2006-2016, with an increase of 0.7 °C in water temperature and 2.3 in average salinity of the GB, with respect to 1959-1970. Salinity showed an increase in the distribution of hypersaline values, and an average 〉 36 in months of high rainfall, with a general average of 35.4 in 1959 -1970 and 37.7 in 2006-2016, this suggests that damming has been a major factor in the increase in salinity. The thermohaline impact in the GB of two hurricanes in 2008 was restored in the short term, with greater inertia in turbidity.
    Description: Published
    Keywords: Southwestern platform ; Space-time variation ; Hydrometeorology ; Plataforma suroccidental ; Variación espacio-temporal ; Hidrometeorología
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 308-318
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  • 3
    Publication Date: 2021-05-19
    Description: The main shing enterprise located in the province of Pinar del Río, Cuba, markets oyster meat packed in brine bags of 460 g. Oysters come from natural bank sheries and farms. During the period 2009 - 2013, captures showed an increasing tendency from 50 t to more than 80 t. However, the recorded oyster meat yields values from 3.3 - 3.9% are considered lower than the minimal acceptable value (4.9%). The aims of this study were to assess oyster exploitation, meat yield and loss in the nal packed product. Monthly and annual variations of meat yield were analyzed regarding capture and oyster size; meanwhile, the meat loss was analyzed by treatments with di erent proportions of oyster / brine. Signi cant di erence (p 〈 0.05) of meat yield (%) was observed by oyster species and size with a better performance in farmed oysters. Traditional packing for commercialization (meat / brine, 391 g / 69 g, respectively, and total weight of 460 g) in uenced meat weight loss by leakage of interstitial uid; this loss was further con rmed by the treatments with di erent proportions of meat / brine where the 1:1 proportion showed the least meat weight loss. In addition, the non-compliance of management measures regarding commercial size, as well as lack of oyster cleanliness before shell removing process, impacted meat yield analyses during 2009 - 2013.
    Description: La empresa pesquera de Pinar del Río, Cuba comercializa el ostión desconchado, carne en salmuera, envasada en bolsas de 460 g. Este recurso proviene de bancos naturales y granjas de cultivo. Aunque la captura de 2009 a 2013 incrementó de 50 a más de 80 t, los rendimientos en carne de ostión mostraron valores de 3.3 a 3.9%, los cuales son inferiores al mínimo aceptable (4.9%). El objetivo de estudio fue evaluar el aprovechamiento ostrícola, rendimiento en carne y merma en el producto envasado. Se analizó la variación mensual y anual del rendimiento y su relación con la captura y la talla; la merma se analizó mediante tratamientos con diferentes proporciones osti ón/salmuera. Se encontraron diferencias signi cativas (p 〈 0.05) en el rendimiento (%) en carne según el tipo de ostión y su relación proporcional con la talla, con mayor rendimiento en el ostión de cultivo. La proporción tradicional de comercialización (carne / salmuera, 391 g / 69 g, respectivamente; peso total de 460 g) incidió en la pérdida de peso en carne por drenaje natural del líquido tisular, corroborado en las pruebas con diferentes proporciones de ostión/salmuera, mostrando menor merma la proporción 1:1. Adicionalmente, el incumplimiento en medidas de manejo, la talla comercial y la falta de limpieza del ostión antes de entregarlo al proceso de desconche pudieron incidir negativamente en el rendimiento en carne durante 2009 - 2013.
    Description: Published
    Keywords: Cuba ; Oyster production ; Meat yield ; Pinar del Rio ; Producción ostrícola ; Rendimiento en carne
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.501-510
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