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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 [5788]
AMERICAS [13328]
ASIA [11782]
EUROPE [4509]
OCEANIA [14]
  • Assessment of overgrowth of the Chelbas group of the Azov Sea Limans with aquatic vegetation

    Bondarenko, L.G.; Kulba, S.N.; Petrashov, V.I.; Smirnov, S.S.; Matveeva, E.I.; Rudakova, N.A. (2021)
    The Chelbas Limans play crucial role in the reproduction of semi-anadromous fish species. The efficiency of their spawning is closely related to the overgrowth of spawning grounds, therefore, the study of aquatic vegetation in the limans is essential for fisheries. This study is aimed at the investigation of the area and intensity of overgrowth of the Chelbas Limans with aquatic vegetation using remote sensing and GIS technologies. The materials on the dynamics of overgrowth of the Azov Sea limans belonging to the Chelbas group are presented for the period 2016–2021. The assessment of the overgrowth of these water bodies was carried out using the Modified Normalized Difference Water Index (MNDWI) and the radiometric Normalized Difference Vegetation Index (NDVI), which were calculated from the multispectral images of the European Space Agency Sentinel-2 satellite. The data of satellite remote sensing have been compared with the data of botanical surveys and visual observations. The area of overgrowth with aquatic vegetation in the Kushchevaty Liman varied within the range from 15 to 93 %, in the Gorkiy Liman it ranged within 12–65 %, and in the Sladkiy Liman the overgrowth area did not exceed 1.7 %. A four-level classification of the overgrowth of the water bodies according to the NDVI is proposed: class 0 is from -1.0 to -0.1, class 1 is from -0.1 to 0.3, class 2 is from 0.3 to 0.5, and class 3 is from 0.5 to 1.0. Examination of the aquatic vegetation in the Chelbas Limans has shown the dependence of the area of overgrowth of these water bodies with macrophytes on the regime of freshwater and seawater influx to the limans.
  • Application of GIS technology in the investigation of morphometric characteristics of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir

    Kochetkova, A.I.; Bryzgalina, E.S. (2021)
    The shallow waters of the Upper Reach are the most productive natural spawning grounds in the Tsimlyansk Reservoir. The hydrological regime of the Upper Reach is of a channel type, which results in a high flow rate and contributes to the formation of deep-water areas and shallow-water ones (riffles) along the channel. In turn, deep-water areas play a key role in the preservation of aquatic biological resources during the most unfavorable periods of the year. This work was aimed at the comprehensive morphological investigation of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir in 2019, as well as at the analysis of the materials collected in its course. This article presents the data collected during the bathymetric survey of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir; using GIS, the morphometric characteristics of seven wintering pits have been calculated, and three-dimensional models of the bottom relief of these wintering pits have been created. During this investigation, three new wintering pits — Kalachevskaya, Lipo-Lebedenovskaya, and a pit in the vicinity of khutor Peskovatka — have been identified. A comprehensive analysis of the collected data indicates that the most pronounced in terms of the bottom topography wintering pits are Kalachevskaya, Golubinskaya, Nabatovskaya, and Peskovatskaya.
  • Stock assessments in the Mediterranean Sea 2021 – Adriatic and Ionian Seas (STECF-21-15).

    Simmonds, J.; Bitetto, I.; Cikes Kec, V.; Daskalov, G.; Isajlovic, I.; Kupshus, S.; Mantopoulou, D.; Murenu, M.; Orio, A.; Pierucci, A.; et al. (European UnionLuxembourg, 2021)
    Commission Decision of 25 February 2016 setting up a Scientific, Technical and Economic Committee for Fisheries, C(2016) 1084, OJ C 74, 26.2.2016, p. 4–10. The Commission may consult the group on any matter relating to marine and fisheries biology, fishing gear technology, fisheries economics, fisheries governance, ecosystem effects of fisheries, aquaculture or similar disciplines. This report is from STECF Expert Working Group 21-15: 2021 stock assessments of demersal stocks in Adriatic, Ionian and Aegean Seas from the meeting held remotely from 18th to 22th October 2021. A total of 9 fish stocks were evaluated. One stock had prior advice from 2020 for 2021 and 2022, and this is reiterated here. Index advice for 2022 and 2023 is provide for one other stock. The EWG reports age based assessments and short term forecasts for 5 of the remaining 7 stocks and surplus production assessments for two stocks. The content of the report gives the STECF terms of reference, the basis of the evaluations and advice, summaries of state of stock and advised based on either the MSY approach for assessed stocks or the precautionary approach for category 3 based advice. The report contains the full stock assessment reports for the 7 assessments, the exploration of assessments and category 3 evaluations for the remaining five stocks. The report also contains the STECF observations and conclusions on the assessment report. These conclusions come from the STECF Plenary meeting November 2021.
  • Stock Assessments in the Mediterranean Sea – Adriatic, Ionian and Aegean Seas (STECF-20-15).

    Simmonds, J.; Bitetto, I.; Vania, C.K.; Daskalov, G.; Ligas, A.; Mantopoulou, D.; Murenu, M.; Orio, A.; Pierucci, A.; Ticina, V.; et al. (European UnionLuxembourg, 2020)
    The working group was held in remotely, from 12th to 20th Sept 2020. The meeting was attended by 14 experts in total, including two STECF member and two JRC experts. The EWG had two observers who attended part time. The objective of the Mediterranean Methodology EWG 20-15 was to carry out assessments and provide draft advice for stocks identified in the ToR supplied by STECF. An initial plenary session commenced at 09:30 on the first day. The ToRs were discussed and examined in detail. Stocks were allocated to participants based on expertise. An ftp repository was created ad-hoc to share documents, data and scripts and prepare the report. The stocks were evaluated by the GSA groups identified in the ToRs. Most of the work was concluded by Tuesday 20 Sept, after 7 full days of work, and some additional work at the weekend. Over the 7 working days plenary sessions were held each day to monitor progress and share results. The overall conclusions for each stock were discussed and finalized in plenary on the Tuesday.
  • Stock Assessments: demersal stocks in the western Mediterranean Sea (STECF-21-11).

    Simmonds, J.; Bitetto, I.; Certain, G.; Farrè, M.; Panisello, M.G.; Guijarro, B.; Ligas, A.; Mantopoulou, D.; Martin, P.; Maynou, F.; et al. (European UnionLuxembourg, 2021)
    The working group was held in remotely, from 6th to 10th Sept 2021. The meeting was attended by 20 experts in total, including two STECF members and two JRC experts along with one observer. The objective of the Mediterranean Methodology EWG 21-11 was to carry out assessments and provide draft advice for stocks identified in the ToR supplied by STECF. An initial plenary session commenced at 09:00 on the first day. The ToRs were discussed and examined in detail. Stocks were allocated to participants based on expertise. An ad-hoc ftp repository was created to share documents, data and scripts and prepare the report. The stock assessments were evaluated by all participants. Following EWG 21-02 data preparation EWG data was available for assessments much earlier in the meeting, in all cases by Tuesday night. For stocks with assessment issues some sensitivity test were possible, but for DWRS in GSA 1,5,6,7 exploratory assessments were not fully concluded given time limitations. Over the week plenary sessions were held each day to monitor progress and share results. The overall conclusions for each stock were discussed and finalized in plenary on the Friday. After the main meeting it became apparent that the selected assessment for red and blue shrimp in GSA 1 had issues with the form of the model, the model was re-examined and details circulated to all EWG participants. A short 45minute plenary was held on Tuesday 21st and a revised assessment was agreed. This report contains this final assessment and advice based on it.

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