Anzali Lagoon
37°28′16″N 49°27′44″E / 37.47111°N 49.46222°E
Anzali Lagoon (also Anzali Mordab, Anzali Bay, Pahlavi Mordab, Pahlavi Bay or Anzali Liman)[1] is a coastal liman, or lagoon, in the Caspian Sea near the Port of Anzali, in the northern Iranian province of Gilan. The lagoon divides Port Anzali into two parts, and is home to both the Selke Wildlife Refuge and the Siahkesheem Marsh.[2]
Although the lagoon suffers from pollution,[3] it is known as a good place for bird watching.[2] The lagoon's water ranges from fresh near the tributary streams to brackish near the mouth into the harbor and the sea. Studies indicate that in the 19th and early 20th Centuries that the lagoon had a much higher salinity.[4]
The lagoon has decreased in size since the 1930s to less than a quarter of its former extent.[4] However, in the last ten years (As of 2007[update]) water salinity has increased both by the rise of the level of the Caspian Sea which has caused greater interchange of waters, and due to greater salt transport in incoming "fresh" water due to increased upstream irrigation.[4][5]
Fishery
Prior to 1950 the Anzali Lagoon provided about 70% of the commercial fish taken in Gilan Province, with catches of over 5,000 tons annually.[1] Commercial fishing was done during the spring and autumn spawning cycles when the kutum, pike-perch and bream, would enter the lagoon from the Caspian.[1] However, a number of factors acted against the continuation of the fishery and by the time commercial fishing ceased in 1960 annual catches were less than 100 tons.[1] Heavy siltation from increased upstream irrigation had resulted in the shrinkage and shallowing of the lagoon, increased pollution of the source waters and eutrophication due to an increased nutrient load contributed to the destruction of the fishery. More recently the surface of the lagoon has become gradually overgrown with aquatic macrophytes, primarily the non-native water-fern, Azolla filiculoides, and this has caused increased eutrophication, creating large areas of the lagoon where there is insufficient dissolved oxygen for fish to survive.[6][7]
Geography
Islands
Among the islands located in the lagoon are Bozorg, Kouchak, and Mianposhteh.[8]
Tributaries
The following rivers and streams flow into the Anzali Lagoon.[9]
- Pirbazar
- Pasikhan
- Shakhraz
- Gazrudbar
- Massuleh
- Palanghvar
- Abatar
- Khalkai
- Morghak
- Bahambar
- Shaf
Notes
- ^ a b c d Holčik, Juraj and Oláh, János (1992) "Introduction" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
- ^ a b "IR016: Anzali Mordab complex" Birdand International, accessed 29 November 2008
- ^ Pourang, N. (1996) "Heavy metal concentrations in surficial sediments and benthic macroinvertebrates from Anzali wetland, Iran" Hydrobiologia 331(1/3): pp. 53–61, p.53, et.seq.
- ^ a b c Holčik, Juraj and Oláh, János (1992) "2.3 Status of the Anzali Lagoon" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
- ^ Final Report of the 5th Meeting on Anzali Lagoon Adaptive Management Pilot Initiation Project (17 April 2007), Caspian Environment Program (CEP), p. 4, accessed 28 November 2008
- ^ Holčik, Juraj and Oláh, János (1992) "2.3.3 Azolla invasion" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008
- ^ Jamalzad, F.; Nezami, Sh. and Sefat, A. Darvish (2004) "Investigation of trophic states in the Anzali Lagoon using GIS" Intecol 7th International Wetlands Conference, Utrecht, Netherlands
- ^ "About Guilan Province: Anzali Wetland" Guilan Province Water and Wastewater Company, accessed 28 November 2008
- ^ Holčik, Juraj and Oláh, János (1992) "Table 4: A suspended sediment transport to Anzali Lagoon in 1990–91" Fish, Fisheries and Water Quality in Anzali Lagoon and Its Watershed Food and Agriculture Organization, Rome, accessed 29 November 2008