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AFRICA [5788]
AMERICAS [13319]
ASIA [11782]
EUROPE [4492]
  • The first finding of the oriental river prawn Macrobrachium nipponense (De Haan, 1849) in the Lower Don River (Azov Sea Basin)

    Zhivoglyadova, L.A.; Vekhov, D.A.; Spiridonov, V.A.; Guskova, O.S.; Afanasyev, D.F. (2021)
    In September 2019, in the lower reaches of the Don River, two specimens of a shrimp previously unknown for this river basin were recorded. The finding was made downstream of khutor Arpachin. The coordinates of the first finding location are as follows: N 47.258610°, E 40.166330°. The shape and armature of the rostrum, the proportions of the second pereopods, and a number of other morphological characteristics allowed the species to be identified as Macrobrachium nipponense (De Haan, 1849) (Decapoda, Crustacea, Palaemonidae). M. nipponense (De Haan, 1849), or oriental river prawn, is a subtropical shrimp, originated and widely distributed in Southeast Asia, including Japan, China, Republic of Korea, Vietnam, Myanmar and Taiwan. It is known that in the 1980–1990s in the temperate zones, this species was introduced into the cooling ponds of thermal power stations as a target of warm-water aquaculture. Several decades later, M. nipponense began to be observed outside the primary recipient reservoirs. The first findings of this genus were considered to be associated with long-distance migrations of this prawn. However, more recent data have shown that, at least in the south of the temperate zone, the prawns have formed stable populations outside warm water refugia. Finding of the oriental prawn in the Don River not only expands the known range of the species but also gives evidence for the continuation of the process of active expansion of M. nipponense through Eurasian water bodies.
  • Characterization of oil pollution of the Azov Sea in 2016–2020

    Korablina, I.V.; Pavlenko, L.F.; Klimenko, T.L.; Anokhina, N.S.; Ekilik, V.S.; Savchuk, I.A.; Ryzhkova, V.V. (2021)
    This article presents the results of oil pollution monitoring of water and bottom sediments of the Azov Sea in the summer and autumn seasons of 2016–2020. The detected concentrations of petroleum products are given in terms of the total content of the main petroleum components: hydrocarbons, resins, and asphaltenes. In some water samples, the concentrations of petroleum products varied from <0.02 to 2.0 mg/dm3 in summer, and from <0.02 to 0.20 mg/dm3 in autumn. In various years, the weighted average concentrations of petroleum products in water exceeded the maximum permissible level (0.05 mg/dm3) by 0.08–2.6 times in summer, and by 0.08–1.2 times in autumn. In sediments, the concentrations of petroleum products were in the range of <0.02–1.01 g/kg in summer, and 0.02–0.85 g/kg dry weight in autumn; the weighted average concentrations varied from 0.19 to 0.55 mg/dm3 and from 0.25 to 0.34 mg/dm3 during the summer and autumn seasons, respectively. More than a half of the investigated sea bottom sediments belong to the category of pollution indicated by a decrease in species diversity and the replacement of dominant forms. According to the data averaged over the period under study, higher pollution of water and bottom sediments is observed in the central regions of the Taganrog Bay and the sea. The most significant inflow of petroleum products occurs in the eastern regions of the Taganrog Bay and the sea in autumn, and in the southern region of the sea in summer.
  • Manuel de formation et de sensibilisation sur tortues marines, cétacés et poissons cartilagineux reconnaissance des espèces et de leurs statuts

    Bradai, Mohamed Nejmeddine; Ennajar, Samira; Saidi, Béchir; ASCOB-Syrtis (INSTM-Institut National des Sciences et Technologies de la MerTunis, Tunisie, 2021)
    Au cours des dernières décennies, le statut de nombreux vertébrés marins s'est détérioré rapidement au niveau mondial, et plusieurs espèces et populations sont maintenant en danger critique d'extinction. La pêche accidentelle est considérée comme la plus grande menace pour ces taxa. Les élasmobranches constituent le groupe de poissons le plus menacé dans le monde et en Méditerranée. 53 % des espèces méditerranéennes sont très menacées (vulnérables, en danger et en danger critique) et 13 % sont à données insuffisantes (IUCN). Devant cette situation, plusieurs outils de protection ont été élaborés tels que les plans d’action FAO et SPA/RAC et la recommandation GFCM/42/2018/2. Les espèces de l’annexe II concernées par la recommandation CGPM sont parfois pêchées accidentellement et commercialisées. Les dauphins les plus rencontrés en Tunisie sont menacés ; vulnérables ou en danger en Méditerranée selon les évaluations de l’IUCN et listés dans l’annexe II du protocole ASP/DB. De même, les espèces de tortues marines présentes dans les eaux tunisiennes sont également menacées : la caouanne Caretta caretta et la tortue luth Dermochelys coriacea sont vulnérables et la tortue verte Chelonia mydas est en danger (IUCN – Méditerranée). Une confusion dans l’identification des espèces et surtout pour les requins et raies pose problème dans les actions de conservation. A cet effet, une attention particulière a été donnée à la détermination taxonomique des différents taxa concernés dans ce manuel. Ce manuel donne également des informations sur le statut et l’écobiologie de ces espèces. Ce document est préparé pour la mise en œuvre du projet :"Statut des élasmobranches et des tortues marines et des cétacés dans les pêcheries de sennes tournantes et palangre de surface au golfe de Hammamet" exécuté par ASCOB-Syrtis et le laboratoire Biodiversité marine de l’INSTM et ce dans le cadre du mécanisme de support pour combler les principales lacunes dans les connaissances des espèces vulnérables (mammifères marins, oiseaux de mer, tortues de mer et élasmobranches) menacées par la pêche dans les zones prioritaires de la Méditerranée, coordonné par le SPA/RAC en partenariat avec ACCOBAMS, BirdLife international, MEDASSET et IUCN avec un soutien financier de la Fondation MAVA. Ce travail s’insère également dans la mise en œuvre de l’IPOA-SHARK, des plans d’Action Méditerranéens de conservation des poissons cartilagineux, des tortues marines et des cétacés élaborés par le SPA/RAC dans le cadre de la Convention de Barcelone et également du plan national de conservation des tortues marines.
  • Hydrochemical and hydrobiological characteristics of the lakes of the Shchuchinskо-Borovsk resort zone (Northern Kazakhstan) and the main methodological approaches to assessing the ecological state of small water bodies

    The book is a result of an international project on cooperation between Kazakhstan and Israel. The monograph includes data on hydrochemistry and hydrobiology of six lakes in the Shchuchinsko- Borovsk resort zone (Northern Kazakhstan). It provides information on the current state, interannual changes and the spatial distribution of chemical parameters and the structure of phytoplankton and zooplankton communities. A comprehensive assessment of the ecological state of lakes is given on the basis of chemical and biological indicators. Methods and problems associated with assessing the health of aquatic ecosystems are discussed. It also provides the systematic understanding of the diversity of planktonic algae and invertebrates.
  • On the joint influence of body size and water temperature on the growth rate of the Pacific oyster (Сrassostrea gigas, Thunberg) in the Donuzlav Liman (Black Sea)

    Zolotnitskiy, A.P.; Orlenko, A.N. (2021)
    The Pacific oyster (Сrassostrea gigas, Thunberg) is a cultivated species of a world-wide importance, which results in the relevance of the investigation of its growth rates in various areas of the World Ocean. This parameter defines the time needed for an individual to reach its commercial size and characterizes cost-effectiveness of cultivation of different species of hydrobionts. Within this context, it is essential to investigate not only the general regularities and patterns of the Pacific oyster’s growth, but also how it is influenced by other environmental factors. In this work, the joint influence of body size and water temperature on the linear growth of diploid individuals of the Pacific oyster in the Donuzlav Liman (Black Sea) is investigated. Quantitative characterization of the relationship between shell height (H, mm) and the age of a mollusc (t), which is similarly well described by the von Bertalanffy equation and power function, is presented. Analysis of the changes in absolute growth rate (Ph, mm/day) in dependence to body height (H, mm) and water temperature (T, °С) has been conducted. It is shown that the growth rate of oysters was steadily decreasing with their height gain, all the while seasonal changes in water temperature (T, °С) closely correlated with the absolute growth rate of a shell and were characterized by a positive relation. Following the available data, a mathematical model, where Ph can be presented as a function of two variables, water temperature and body size, is proposed; it is expressed by the equation. The presented model of multiple regression has adequately described the dynamics of Ph (coefficient of determination 0.71) in the course of 3-year rearing of the Pacific oyster. Observed deviations (0.29) have been associated with the early stages of ontogenesis and with reproduction processes of this species.

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