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The data of long-term ecological studies (1999–2014) are used for assessing the impact of a new Caspian invader Mnemiopsis leidyi A. Agassiz, 1865 on marine and anadromous fish species. The introduction of the ctenophore and its massive development in the Caspian Sea have mainly affected planktophagous fish, especially the most abundant species anchovy sprat (Clupeonella engrauliformis Borodin, 1904) and sturgeons (Family Acipenseridae). Mnemiopsis leidyi is one of the main negative factors preventing the restoration of the populations of Caspian fishes, especially anchovy tyulka. The critical state of the resources of the spawning parts of sturgeon populations (Family Acipenseridae) has been reinforced as a result of the massive development of M. leidyi.

The main focus of review: To determine the Status of invasive species with special attention to the most aggressive invader Mnemiopsis leidyi in the Caspian Sea.

Objectives:

1. To assess vectors, pathways of invasive species introduction, their composition and their role in the Caspian ecosystem.

2. To analyze seasonal and interannual dynamics of the Mnemiopsis leidyi population in the all areas of the Caspian Sea; its impacts on the Caspian ecosystem including food recourses (zooplankton) and fish stocks along with other emerging environmental threats such as increased nutrient load from the coast, structural and quantitative changes in phyto-and-zooplankton communities, the appearance of harmful algal bloom (HAB) in the Southern Caspian.

3. To prepare recommendations for follow-up actions on invasive species management: - for the protection and control of the Caspian Sea from any sources of accidental invasive species introductions - for possibility of biological control of invader Mnemiopsis leidyi.

The primary source of this Review has been national reports from every of the five Caspian littoral countries, which included results of national observations of ecosystem state and biodiversity of the Caspian Sea. But due to fragmental data of the national observations on invasive species

The Tauw Consortium (TC) formed by Tauw bv - the Netherlands, Milieukontakt International (MKI) - the Netherlands, International HCH and Pesticides Association (IHPA) - Denmark and COWI A/S - Denmark, was selected by the World Bank in October 2009 to execute a Caspian regional POPs workshop in Azerbaijan. TC forms a strong OP, POP and hazardous chemicals team that has cooperated in different combinations in many projects in Central Asia and the Caucasus. Local partner was Mr. Islam Muslim Mustafayev the director of the Azerbaijan branch of the Caucasus Environmental NGO Network.

The workshop aiming at the improvement of obsolete pesticides management was held at the World Bank Office in Baku, from 7 till 11 December 2009 with participants from the five Caspian littoral states and donor organizations (World Bank, FAO). The workshop comprised sessions on: - An update on implementation of international requirements related to obsolete/ POPs pesticides - Development and strengthening of legal and institutional framework - Public awareness raising - Technical problems and priorities The workshop was held as an interactive workshop in which participants presented the current state of the abovementioned aspects of pesticide management for their country. Difficulties and gaps were discussed and ideas were developed in order to bridge the gaps identified. A legal gap analysis showed that in all countries there are gaps in legislation concerning the pesticides cycle. POPs often are not included and legislation needs to be aligned with international requirements. There is a lack of coordination between institutions and stakeholders in most countries. In many countries environmental and human health problems related to obsolete pesticide stocks are aggravated by a lack of awareness. Russia and Azerbaijan presented their experiences with inventory and technical difficulties. The presentations showed that there are problems with planning and coordination, a lack of environmentally sound storage capacity, a lack of knowledge concerning the scale of the problem (reliable and complete national inventory) and a lack of knowledge concerning handling of liquid pesticides. Action plans were presented, which for some countries like Russia, were plans of different options (signing the convention, detailed inventory, pilot on implementation PSMS). Also for Turkmenistan, ratification of the Stockholm Convention is a big challenge. For other countries like Azerbaijan, there is a follow up project about to start. Therefore the action plan for Azerbaijan comprises a number of defined steps already (capacity building, full national inventory). Iran presented an action plan for repackaging of obsolete pesticides in the Golestan province.