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Predation rate of Panulirus argus (Decapoda: Palinuridae) on gastropod mollusks in two fishing areas of southern Cuba.
No full textThe meso-predator Panulirus argus has an impact on the populations of benthic mollusks that constitute its food. In the present study, composition of P. argus diet and predation pressure exerted on gastropods population from Santa Cruz del Sur (SCrso) and Gulf of Batabanó (GB) fishing regions, Cuba, were determined. Gastropod density and diversity were quantified by trawling, which based on the abundance of lobsters reported for each region, served to estimate the impact of predation on gastropod community. 250 lobsters were captured: 62 from SCrso in October 2012, 136 from GB in February 2014 and 52 from GB in July 2018. The void was similar in SCrso (38.7%) and GB (38.0%). Thirteen trophic categories were recorded, the most frequent: operculums (48.8%), crustacean remains (48.0%), shell remains (47.2%) and plant remains (35.0%), showing that the diet is mainly composed of mollusks and crustaceans. The frequency of occurrence of plant remains suggests nonaccidental consumption. Seventeen species of mollusks were identified, being Tegula fasciata, Phrontis antillarum, Aliger gigas, Turbo castanea and Chione cancellata the most frequent. The most predated species were T. fasciata (3.36), P. antillarum (0.54) and A. gigas (0.45). Predation pressure was 0.92 gastropods lobster-1 in SCrso and 3.31 gastropods lobster-1 in GB, which according to the respective densities of lobsters (3,546 lobsters km-2 and 3,837 lobsters km-2) and gastropods (3.76 ind. m-2 and 1.45 ind. m-2), allowed estimating that lobsters consume 0.087% of the gastropod community in SCrso and 0.887% in GB. Evidence of cannibalism was also found.La langosta espinosa Panulirus argus es un mesodepredador que tiene un impacto en las poblaciones de moluscos bentónicos que constituyen su alimento. En el presente estudio, se determinó la composición de la dieta de P. argus y la presión de depredación que ejerce sobre los gastrópodos de las regiones pesqueras Santa Cruz del Sur (SCrso) y golfo de Batabanó (GB), Cuba. Mediante arrastres se cuantificó la densidad y diversidad de gastrópodos, que, basado en la abundancia de langostas, sirvió para estimar el impacto de la depredación. Se capturaron 250 langostas: 62 en SCrso octubre 2012, 136 en el GB febrero 2014 y 52 en el GB julio 2018. La vacuidad fue similar en SCrso (38,7%) y en el GB (38,0%). Se registraron 13 categorías tróficas, las más frecuentes: opérculos (48,8%) y restos de crustáceos (48,0%), de conchas (47,2%) y vegetales (35,0%), demostrando que la dieta se compone principalmente de moluscos y crustáceos. La frecuencia de ocurrencia de vegetales sugiere consumo no accidental. Se identificaron 17 especies de moluscos, siendo Tegula fasciata, Phrontis antillarum, Aliger gigas, Turbo castanea y Chione cancellata las más frecuentes. La mayor tasa de depredación fue sobre las especies T. fasciata (3,36), P. antillarum (0,54) y A. gigas (0,45). La presión de depredación fue 0,92 gastrópodos langosta-1 en SCrso y 3,31 gastrópodos langosta-1 en el GB, lo que según las respectivas densidades de langostas (3.546 langostas km-2 y 3.837 langostas km-2) y gastrópodos (3,76 ind. m-2 y 1,45 ind. m-2), demostró que P. argus consume 0,087% de los gastrópodos en SCrso y 0,887% en el GB. Se encontraron además evidencias de canibalismo.PublishedReferee
Effect of the agricultural biostimulant VIUSID agro on the growth of two species of marine microalgae.
No full textEn los gastos asociados al cultivo de microalgas, el uso de medios de cultivo como Guillard (f/2) representa entre el 30-40 % de los costos de operación y estos pueden ser disminuidos hasta siete veces mediante el uso de fertilizantes agrícolas, pues son económicos y contienen los nutrientes indispensables para el crecimiento de las microalgas. Un fertilizante que pudiera utilizarse en esta rama de la acuicultura es VIUSID agro, un promotor del crecimiento vegetal. Para ello, se evaluó el efecto del bioestimulante agrícola VIUSID agro en el crecimiento de las microalgas Dunaliella salina y Thalassiosira sp., que constituyó el objetivo del trabajo. La investigación se llevó a cabo en el laboratorio de producción de alimento vivo en el Centro de Investigaciones Pesqueras (CIP). Se evaluaron dos concentraciones diferentes de VIUSID agro: 0,5 mL y 1 mL que se añadieron a 2 000 mL de agua de mar estéril para utilizarlo como medio de cultivo y el crecimiento de las microalgas se comparó con los resultados obtenidos en el medio Guillard (f/2), utilizado como control. Se realizaron conteos diarios en un microscopio óptico con un hematocitómetro y se determinó la concentración de células por mililitro. Como resultado se obtuvo mayor crecimiento de ambas microalgas en el medio control y fue muy superior al de los tratamientos empleados. Estos resultados se deben al bajo contenido en nitrógeno del VIUSID agro y a la presencia de metales pesados en concentraciones superiores a las que pueden tolerar las microalgas estudiadas.In the expenses associated with the cultivation of microalgae, the use of culture media such as Guillard (f/2) represents between 30-40 % of the operating costs and these can be reduced up to seven times using agricultural fertilizers, since they are cheap and contain the essential nutrients for the growth of microalgae. A fertilizer that could be used in this branch of aquaculture is VIUSID agro, a plant growth promoter. For this, the effect of the agricultural biostimulant VIUSID agro on the growth of the microalgae Dunaliella salina and Thalassiosira sp., which is the objective of our study, was evaluated. The research was carried out in the live food production laboratory at the Centro de Investigaciones Pesqueras (CIP). Two different concentrations of VIUSID agro were evaluated: 0,5 mL and 1 mL that were added to 2 000 mL of sterile seawater to be used as a culture medium and the growth of the microalgae was compared with the results obtained in the Guillard medium (f/2), used as a control. Daily counts were made under a light microscope with a Neubauer grid-equipped hematocytometer and the concentration of cells per milliliter was determined. As a result, greater growth of both microalgae was obtained in the control medium and it was much higher than that of the treatments used. These results are due to the low nitrogen content of VIUSID agro and the presence of heavy metals in higher concentrations than those that can be tolerated by the microalgae studied, which limited their growth.PublishedReferee
Degradation - resilience of the main vegetation cover, after the impact of Hurricane Irma in the keys of the northeast of Villa Clara, Cuba
No full textEl huracán Irma azotó la cayería noreste de Villa Clara el nueve de septiembre de 2017. La extensión de la región y la inaccesibilidad a muchos sitios de su geografía impidieron una valoración precisa de las afectaciones territoriales en el corto plazo. La percepción remota y el procesamiento de imágenes empleando QGIS, suministran las herramientas necesarias para la estimación de las mismas en nuestra investigación. Se determinó la dis- tribución actual de los hábitats naturales, y se seleccionaron las principales coberturas ve- getales como objeto de estudio. Con el uso del índice de vegetación normalizada (NDVI) se estima la degradación-resiliencia en el periodo 2016-2021. Los procesos de defoliación y rebrote constituyen las señales básicas en estas evaluaciones. Las afectaciones severas del huracán se estiman sobre el 82% del manglar (M), el 50% del bosque siempreverde micró- filo (BSV) y 29% del matorral xeromorfo (MX). El BSV y el MX mostraron una recu- peración muy veloz, en comparación con el M. La dominancia de Rhizophora mangle en este hábitat afectado resulta determinante en la retardada resiliencia. El 58% de manglar recuperado a los 3.6 años del huracán sugiere planificar estrategias de restauración en los sitios críticos identificados.Hurricane Irma hit the northeast keys of Villa Clara on September 9, 2017. The vast region and the inaccessibility to many places of its geography, prevented an accurate assessment of the effects on the territory. Remote sensing and image processing using QGIS provide the necessary tools for image estimation in our research. The current distribution of natural habitats was determined, selecting the main plant covers as the object of study.With the use of the normalized difference vegetation index (NDVI) the degradation-resilience is estimated in the pe- riod 2016-2021. The processes of defoliation and regrowth are the basic signals in these evaluations. The severe effects of the hurricane are estimated at 82% of the mangrove (M), 50% of the dry evergreen forest (BSV) and 29% of the xe- romorphic scrub (MX). The BSV and MX showed a very fast recovery, compared to the M. The dominance of Rhi- zophora mangle in this affected habitat is decisive in the deayed resilience. 58% of mangroves recovered 3.6 years after the hurricane suggest planning restoration strategies at the identified critical sites.PublishedReferee
Method Standardization and Guidance Value Determination for Regulation on Formaldehyde in Round Scad (Decapterus spp.).
No full textThere are reports of traded Galunggong (Fil.), Decapterus spp., adulterated with formaldehyde (FA) to lengthen shelf life. FA is a noxious substance with negative repercussions to general consumer health. This warrants the determination of a guidance value due to a lack of a local regulatory value specific to Galunggong amidst rising Filipino public concern in the wake of importations complicated by the natural occurrence of FA in the marine fish post-mortem. Comparisons were made on FA levels of fish treated with different conditions exposure and with colorimetric measurements using 405 nm and 412 nm via Nash’s method optimized for a fish matrix with no significant difference in measurement to at most 30 ppm FA in an aqueous matrix. There is also no significant difference in FA content of samples measured immediately from those frozen overnight. Therefore, in line with the regulatory mandates of the Bureau of Fisheries and Aquatic Resources (DA-BFAR) of the Department of Agriculture (Republic of the Philippines), a guidance value of 46.24 μg FA/g of Galunggong or 46.24 ppm is suggested, which is obtained from FA measurements of fish subjected to minimal anthropogenic treatments in different conditions of adulteration. Samples from different Metro Manila wet markets serve as the baseline. The guidance value is suggested to be used as a reference for regulatory purposes and can be improved with a more widespread sampling of fish from landing to selling.PublishedReferee
Роль коловраток в повышении качества вод в рыбоводном пруду
No full textRotifers are common in fresh and brackish water bodies, in coastal areas of the seas, and can be an effective tool for analyzing the state of the environment. The ability of rotifers to adapt to unfavourable environmental conditions has been considered in the course of studying the species composition of rotifers in a fish pond near Moscow under the conditions of the supply of organic artificial food for fish and changes in the temperature regime of water. During the period of increased temperature of the water (21–25 °C) and decrease in the concentration of dissolved oxygen from the surface to the bottom layers of water from 3.8 to 0.2 mgO2/L in early July, Asplanchna priodonta helvetica, Brachionus angularis angularis and Brachionus calyciflorus dominated in the pond (98–100 % of the abundance and 99–100 % of the biomass of rotifers). During the period of elevated temperatures, the turbidity indices in the upper layer (0.2–0.5 m) were an order of magnitude lower than those in the deeper layers of the reservoir. Bacteria and tiny particles served as food for rotifers. The temperature of 18–25 °C was favourable for the development of B. angularis angularis in the fish pond. At a temperature of 18 °C, its abundance reached 1,500 ind./L (70 % of the abundance of rotifers). In August, when the temperature of the water column decreased from 20 to 18 °C, the biomass of A. priodonta helvetica changed from 0.3 to 9.5 mg/L (99 % of the biomass of rotifers). Polyarthra vulgaris dominated among small rotifers. During the period of low temperatures, the biomass of rotifers increased to 20 mg/L; its basis was A. priodonta helvetica. Rotifers are able to adapt to conditions of high organic input in a wide range of temperatures and participate in the restoration of water quality in a fish pond.Коловратки распространены в пресных и солоноватых водоемах, в прибрежных районах морей и могут быть эффективным инструментом, применяемым для анализа состояния окружающей среды. Способность коловраток адаптироваться к неблагоприятным условиям среды рассмотрена в ходе исследования видового состава коловраток в подмосковном рыбоводном пруду в условиях поступления органического искусственного корма для рыб и изменения температурного режима толщи воды. В период повышенной температуры толщи воды (21–25 °C) и снижения концентрации растворенного кислорода от поверхностного до придонного слоев воды с 3,8 до 0,2 мгO2/л в начале июля в пруду доминировали Asplanchna priodonta helvetica, Brachionus angularis angularis и Brachionus calyciflorus (98–100 % численности и 99–100 % биомассы коловраток). В период повышенных температур показатели мутности в верхнем слое (0,2–0,5 м) были на порядок меньше по сравнению с таковыми в более глубоких слоях водоема. Бактерии и мельчайшие частицы служили кормом коловраткам. Температура 18–25°C являлась благоприятной для развития B. angularis angularis в рыбоводном пруду. При температуре 18 °C ее численность достигала 1 500 экз./л (70 % численности коловраток). В августе при снижении температуры толщи воды от 20 до 18 °C биомасса A. priodonta helvetica изменялась от 0,3 до 9,5 мг/л (99 % биомассы коловраток). В составе мелких коловраток доминировала Polyarthra vulgaris. В период пониженных температур биомасса коловраток возросла до 20 мг/л; ее основу составляла A. priodonta helvetica. Коловратки способны адаптироваться к условиям высокого органического поступления в широком диапазоне температур и участвовать в восстановлении качества воды в рыбоводном пруду.PublishedReferee
Водные биоресурсы и среда обитания, том 5, вып. 1
No full textVertical distribution of biogenic elements in Gelendzhik area in 2019 has been presented. Hydrochemical criteria for typification of the Azov limans of the Krasnodar Territory as the spawning grounds for semi-anadromous fish species have been enlisted. Use of the thermohaline method for determining the quasi-heterogeneity of the water masses in the Azov Sea is discussed. Age composition and linear growth of the invasive ark clam species (Anadara kagoshimensis (Tokunaga, 1906)) in the Kerch Strait have been estimated. Effect of different doses of pituitary hormone on the reproductive performance of shemaya females (Alburnus leobergi, Freyhof & Kottelat, 2007) has been studied. Heavy metals and arsenic in water, bottom sediments and Black Sea turbot (Scophthalmus maeoticus, Pall., 1814) in the Caucasian Shelf area in the Black Sea (1995–2020) have been traced. Exotic fish species off the Black Sea coast of the Krasnodar Territory are presented. Problems of using riverbed ponds in aquaculture (in the context of recent legislative changes) are considered.PublishedReferee
Ecological Sustainability Index of hydrographic sub-basins (ESI-sb): for the management of the Upper Paraná River, Brazil.
No full textThe assessment of sustainable development in sub-watersheds plays a central role in rationalizing the decisions taken. A promising form of average indicators of this development is through indicators, and when many are used, they are usually aggregated into indices, which provide a simplified and multidimensional view of the system under analysis. Several sustainability indices for watersheds are proposed in the literature. However, incorporation of extraordinary indicators, that biodiversity, a gap is still a major upgrade. Therefore, the use of biodiversity indicators as representative of the environmental dimension constitutes an advance on the indices presented in the literature recently. The objective was to evaluate the sustainability gradient in the hydrographic basins of the Upper Paraná River, through an eco-environmental sustainability index of hydrographic sub-basins (ISE-sb) that incorporates protected ecological. For this purpose, the indicators selected based on the propositions of Agenda 2030 were identified in four dimensions of sustainability, economic, economic, environmental and thought through a process of sustainability: normal and social. Then, the importance of the indicators was considered, using the multi-criteria analysis based on the Hierarchical Process Analysis (HP) method. The ISE-sb was calculated by means of the weighted media between the sub-indices that represent as dimensions. Finally, we apply the Gi* statistic to identify hotspots and coldspots. The results show that among the dimensions of sustainability, the highest was the one that presented a positive amount of low values. The regions located in the eastern portion, or serra do mar, southern portion, and the Federal District formed sustainability hotspots, while the sub-basins located in the states of Goiás, Mato Grosso do Sul and Minas Gerais formed the sustainability coldposts. A sustainable spatial planning of the hydrographic sub-basins is recommended, adopting cold areas as priorities for sustainability. It highlights the main methodological limitation, a potential reproducibility of the tool in other spaces.A avaliação do desenvolvimento sustentável em sub-bacias hidrográficas tem um papel central na racionalização das tomadas de decisões. Uma forma promissora de medir esse desenvolvimento, é por meio de indicadores, e quando muitos indicadores são usados, eles são usualmente agregados em índices, que fornecem uma visão simplificadae multidimensional do sistema em análise. Diversos índices de sustentabilidade para bacias hidrográficas são propostos na literatura. Entretanto, a incorporação de indicadores ecológicos aquáticos, que agreguem aspectos da biodiversidade é, ainda, uma lacuna ainda a ser preenchida. Portanto, a utilização de indicadores de biodiversidade como representantes da dimensão ambiental, se constitui em um avanço aos índices recentemente apresentados na literatura. O objetivo ,foi avaliar o gradiente de sustentabilidade nas bacias hidrográficas do alto rio Paraná, por meio de um índice de sustentabilidade ecoambiental de sub-bacias (ISE-sb) que incorpora indicadores ecológicos aquáticos. Com esse propósito, os indicadores selecionados com base nas proposições da Agenda 2030, foram divididos em quatro dimensões de sustentabilidade: social, econômica, ecoambiental e ambiental negativo, e passaram por um processo de normalização e filtragem. Em seguida, foi ponderada a importância dos indicadores, utilizando-se da análise de multicritério baseada no método Análise de Processos Hierárquicos (AHP).O ISE-sb foi calculado por meio da média ponderada entre os subíndices que representam as dimensões. Por fim aplicamos a estatística espacial Gi* para identificar agrupamentos de hotspots e coldspots. Os resultados mostram que entre as dimensões da sustentabilidade, aquela que apresentou a maior quantidade de valores baixos, foia ambiental positiva. As regiões localizadas na porção leste, ou serra do mar, porção sul, e o Distrito Federal formaram hotspots de sustentabilidade, enquanto que as sub-bacias localizadas nos estados de Goiás, Mato Grosso do Sul e Minas Gerais formaram os coldposts de sustentabilidade. Recomenda-se um planejamento espacial sustentável das sub-bacias hidrográficas, adotando as áreas de coldspots como prioritárias para sustentabilidade. Evidencia a principal limitação metodológica, a potencial reprodutibilidade da ferramenta em outros espaços.Master
Statistical data of sea ice observation in the recent 30 years
No full textIce information center open every winter at the 1st Regional Coast Guard Headquarters. For safe navigation, we collect and analyze data of sea ice observations from C.G. offices, stations and relative organizations, and offer ice information as sea ice condition charts and navigational warnings. In this report, we summarize observation results of coastal sea ice stations from C.G. offices etc. in the recent 30 years.PublishedReferee
The mangrove oyster Crassostrea rhizophoraeː bibliographic compilation.
No full textSe abordó el papel de las bibliotecas especializadas como líderes en la comunicación de los resultados científi cos en un centro de investigación de las ciencias marinas y medioambientales en Cuba, su vínculo con las empresas pesqueras y la importancia de la información científi ca como punto de partida para el desarrollo de las tareas de investigación y de explotación del ostión de mangle Crassostrea rhizophorae. La propuesta bibliográfi ca que se presentó tuvo como objetivo acercar a los pescadores y decisores al desarrollo científi co. Para ello, se consultó la base de datos Aquatic Sciences and Fisheries Abstracts, el repositorio AquaDocs, se efectuaron búsquedas con el Google Académico y se contó con la colaboración de diferentes bibliotecas y centros de documentación en Cuba y en el entorno latinoamericano, lográndose registrar un total de 141 documentos, el 36 % de los últimos diez años y el 27 % de casi nula visibilidad, siendo esta una de las fortalezas del producto informativo. Mediante el análisis documental y estadístico, se constató que “Cultivo” fue la categoría temática más recurrente con el 27.1 % del total y que el 33 % de las publicaciones correspondieron a los últimos 10 años. Con el producto informativo elaborado, se agruparon documentos con diversidad temática sobre la especie, especialmente los de escasa visibilidad, facilitándose un mejor acceso del área productiva a esta información, anteriormente muy poco divulgada.The role of specialized libraries as leaders in the communication of scientifi c results in a marine and environmental science research center in Cuba, their link with fi shing companies and the importance of scientifi c information as a starting point for the development of research and exploitation tasks of the mangrove oyster Crassostrea rhizophorae were addressed. The bibliographic proposal that was presented aimed to bring fi shermen and decision-makers closer to scientifi c development. To do this, the Aquatic Sciences and Fisheries Abstracts database, the AquaDocs repository, searches were carried out with the Google Scholar and the collaboration of diff erent libraries and documentation centers in Cuba and in the Latin American environment was carried out, managing to register a total of 141 documents, 36 % of the last ten years and 27 % of almost zero visibility, this being one of the strengths of the information product. Through documentary and statistical analysis, it was found that “Cultivation” was the most recurrent thematic category with 27.1 % of the total and that 33 % of the publications corresponded to the last 10 years. With the informative product elaborated, documents with thematic diversity on the species were grouped, especially those with low visibility, facilitating better access of the productive area to this information, previously very little disclosed.PublishedReferee
Contribution à l'étude de la croissance relative en aquaculture extensive d'une crevette pénéide: cas de Penaeus (Melicertus) kerathurus de la lagune El- Mellah (Algérie).
No full textDans le présent travail, nous avons examiné la croissance relative de la crevette royale Penaeus kerathurus issue de la pêche commerciale de la lagune d’El Mellah. Les relations allométriques reliant les différentes parties du corps des crevettes mâles et femelles expriment toutes sans exception une forte allométrie minorante. Les résultats obtenus dans cette étude concordent avec ceux précédemment décrits chez plusieurs populations de Penaeus kerathurus et ils constituent un nouvel élément de preuve en faveur de l'uniformité génétique de l’espèce le long de son aire de répartition méditerranéenne.In the present work, we examined the relative growth of the caramote prawn Penaeus kerathurus collected from the commercial fishery of the El Mellah lagoon. All allometric relationships between the various body parts of both male and female prawns showed strong negative allometry. The findings of this study are consistent with those previously reported in numerous populations of Penaeus kerathurus and add a new piece of evidence for the genetic uniformity of the species over its Mediterranean range.Référence bibliographique, Figures, Tableau.PublishedReferee