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AquaDocs is the joint open access repository of the UNESCO/IOC InternationaI Oceanographic Data and Information Exchange (IODE) and the International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC) with support from the FAO Aquatic Sciences and Fisheries Abstracts. It is a thematic repository covering the natural marine, coastal, estuarine /brackish and fresh water environments and includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects. [see About]


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AFRICA [5753]
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OCEANIA [14]
  • The inclusion of grothite in the zircon from granitoids of the crystalline basement of the Southern Yamal Peninsula

    Erokhin, Yu. V.; Ivanov, K. S.; Khiller, V. V. (2019)
    Grothite – rare F-Al-rich type of titanite – has been found in accessory zircon from the granitoids of the preJurassic basement of the Verkhnerechensky oil-gas area (in the southern part of the Yamal Peninsula) as a result of the study. Titanite forms rare inclusions (so-called minerals-prisoners) in the central parts of zircon crystals; in our sample of 35 individuals only two grains of titanite have been discovered. The measurement of the chemical composition of the mineral has been carried out on an electron-probe microanalyzer CAMECA SX 100, equipped with five wave spectrometers (IGG UrB RAS, Ekaterinburg). According to the microprobe analysis, the mineral has an unusual chemical composition, it shows the presence of significant concentrations of alumina (Al2O3 to 8.5 wt.%), rare earths elements (REE to 4.3 wt.%), and fluorine (F to 2 wt.%). This grothite is dramatically different in chemical composition from the accessory titanite of the matrix granitoid (monzoleicogranite), which is characterized by values close to the reference sphene. Overall, grothite is an intermediate connection between the two extreme members CaTiSiO4O (titanite) – CaAlSiO4F (synthesized Al-F-titanite), and the Verkhnerechensky mineral content of a hypothetical Al-F-titanite achieves a high level of 24–26 %. Unfortunately, grothite is crystallized in a wide range of temperatures and pressures which does not allow its use in thermodynamic reconstructions. The existence of grothite (or Al-F-titanite) is apparently determined not so much on the PT-conditions of rocks' formation, but most likely on the chemistry of the environment. So it is obvious that the Verkhnerechensky titanite was formed in the melt with an increased concentration of fluorine. It is the first record of grothite in the form of inclusions in accessory zircon.
  • Evaluación del efecto de Bacillus firmus C101 en el crecimiento de poslarvas de Litopenaeus vannamei Boone (camarón blanco) y Brachionus plicatilis s.s. Müller (rotífero)

    Ruiz Toquica, Jordan Steven; Becerra Real, Laura Milena; Villamil Díaz, Luisa Marcela; Acero Pizarro, Arturo (2020)
    La creciente demanda de proteína acuícola sugiere buscar alternativas biotecnológicas que mejoren el cultivo de especies de interés comercial. En este estudio se evaluó Bacillus firmus C101 como promotor del crecimiento y potencial probiótico, el cual fue caracterizado y posteriormente administrado (106 UFC mL-1 * día) en poslarvas de camarón blanco (Litopenaeus vannamei) y en rotíferos (Brachionus plicatilis sensu stricto). Se observó que B. firmus C101 tiene tolerancia a sales biliares, fuerte actividad fosfatasa y actividad antimicrobiana frente a patógenos como Vibrio alginolyticus y Aeromonas hydrophila, entre otros. Por otro lado, tras su administración por tres semanas a poslarvas de camarón causó un aumento significativo (p < 0,05) en la tasa específica de crecimiento (TEC = 3,8 ± 0,7 % día-1), el incremento de peso diario (ADG = 1,5 ± 0,1 mg día-1) y en la tasa de conversión alimenticia (TCA = 1,5 ± 0,1 %) en comparación con los controles sin adición de esta bacteria (PBS estéril). Así mismo, la administración de B. firmus C101 (106 UFC mL-1 * día) a rotíferos causó un aumento en la tasa de crecimiento poblacional (TC = 20,2 ± 1,5 % día-1), fecundidad (F = 0,4 ± 0,03 huevos individuos-1) y productividad (R = 16,0 ± 0,7 individuos mL-1 * día), después de 48 h de cultivo. Con base en lo anterior y en comparación con otros estudios, se sugiere a B. firmus C101 como potencial probiótico y promotor del crecimiento en poslarvas de camarón, y como primer reporte del efecto de su administración en rotíferos. No obstante, se precisan estudios sobre los posibles mecanismos de acción, y pruebas a escala piloto y comercial para validar estos resultados y su posible transferencia al sector productivo.
  • Evaluación de la estructura comunitaria de las esponjas marinas en parches arrecifales del Caribe sur, Costa Rica

    Araya Vargas, Alexander; Busutil, Linnet; García Rojas, Andrea; Pereira Chaves, José Miguel; Piedra Castro, Liliana; Acero Pizarro, Arturo (2020)
    Las esponjas marinas cumplen un gran número de funciones críticas para los arrecifes coralinos. A su vez, las variaciones en la estructura comunitaria de los poríferos pueden indicar cambios en las condiciones ambientales de los ecosistemas donde habitan. Sin embargo, su estudio ha sido escaso en el Caribe de Costa Rica, principalmente en el ámbito ecológico. Por tanto, se evaluó la estructura comunitaria de estos organismos en cuatro parches arrecifales (Perezoso, Pequeño, Coral Garden y el 0,36) y se determinó si podía ser explicada por la sedimentación, el sustrato y la profundidad. Se calculó la abundancia relativa (AR) y la cobertura relativa (CR) para cada especie, la densidad de esponjas e índices de diversidad (riqueza de especies, heterogeneidad de Shannon, equitatividad de Pielou y dominancia de Simpson) para cada sitio de muestreo. Se comparó la similitud entre sitios respecto a las abundancias relativas de esponjas versus sedimentación, sustrato y profundidad. Se encontraron 13 nuevos registros de esponjas para el país. Perezoso presentó la mayor cobertura de esponjas (CR = 6,1 %) compuesta principalmente por Cliona caribbaea (CR = 2,0 %) y con Niphates erecta como especie dominante (AR = 59,3 %). La riqueza de especies aumentó a medida que aumentaba la profundidad en los sitios. Perezoso y Coral Garden mostraron la mayor similitud en cuanto a la abundancia de especies y compartieron a N. erecta, Iotrochota birotulata y Scopalina ruetzleri como las especies más abundantes. Asimismo, compartieron las mayores frecuencias de aparición (40 %) de esponjas perforadoras del género Siphonodictyon y la presencia de la especie bioerosionadora C. caribbaea. La similitud entre Perezoso y Coral Garden podría estar influenciada en mayor medida por la alta disponibilidad de pavimento calcáreo como sustrato predominante (48 < PC % < 67), el cual parece favorecer la abundancia de esponjas heterotróficas y generalistas, así como la de especies perforadoras y bioerosionadoras.
  • Phytoplankton variables dynamics in the Halda River (Bangabandhu Fisheries Heritage), Chittagong, Bangladesh

    Islam, Md.S. (2021)
    The Halda is a river ecosystem of major importance, well-suited for the natural spawning of major carps due to the unique physicochemical and biological properties of its water. The productivity of the Halda ecosystem mainly depends on the plankton density. The present study has been aimed at the determination of qualitative and quantitative density of the phytoplankton in the Halda River during a two-year period extending from January, 2017 to December, 2018. Phytoplankton density is a good indicator of the water quality of a river ecosystem. A total of 74 species of phytoplankton divided into 47 genera belonging to 6 phyla has been recorded. Bacillariophyta was the most dominant phylum of phytoplankton followed by Cyanobacteria, Chlorophyta, Miozoa, Charophyta, and Euglenozoa. The maximum phytoplankton density was recorded during the pre-monsoon period, and its minimum fell upon the post-monsoon period. The phytoplankton showed a positive significant relationship with transparency, total dissolved solids, conductivity, calcium, total hardness, and BOD5 and an inverse significant relationship with water temperature. The water of the Halda River is organically polluted and eutrophic in its nature.
  • Antibiotics resistance in pathogenic bacteria isolated from water and sediment around the floating fish farms in the Nha Trang bay

    Nguyen, Kim Hanh; Nguyen, Trinh Duc Hieu; Nguyen, Minh Hieu; Vo, Hai Thi; Pham, Thi Mien; Hoang, Trung Du; Phan, Minh Thu; Nguyen, Huu Huan (2020)
    To assess the impact of antibiotic use in aquaculture in Nha Trang bay, we conducted this study with the aim of assessing antibiotic resistance of opportunistic pathogenic bacteria isolated from water and sediment around shrimp/fish cages in the Nha Trang bay. 109 strains of Vibrio, Salmonella-Shigella and Aeromonas groups were isolated in the surrounding environment of farming areas in Dam Bay and Hon Mieu. Antimicrobial resistance test of these 109 strains showed that in the water environment in Dam Bay, TET (96.6%) and NIT (92.5%) were the two antibiotics with the highest rates of resistant bacteria while no bacteria were resistant to RIF. All 5 types of antibiotics had a statistically insignificant percentage of antibiotic-resistant bacteria in water samples at Hon Mieu, ranging from 33.3% to 68.9%. Also in the water environment, the rate of antibiotic-resistant bacteria in Dam Bay was not influenced by the distance to the cages (42.5–66.6%). Meanwhile, in Hon Mieu, the highest rate of resistant bacteria was observed at the distance of 200 m (100%) away from cages and the lowest rate at the distance of 100 m (20%). In the sediment environment around the cages, both the Dam Bay and Hon Mieu farming areas showed the highest rates of antibiotic-resistant bacteria against TET, NIF and RIF had the lowest rate of resistant bacteria. Among the total of 109 strains tested for antibiotic resistance, 2 strains labeled TCBS_HM200 m and SS_HM200 m were found to be resistant to all 5 tested antibiotics. These two strains were respectively identified as Vibrio harveyi and Oceanimonas sp.

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