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10 O.E. TUREYEN
Table 6. Ecological Impact Score of Mnemiopsis leidyi
Mnemiopsis leidyi From : Atlantic Coasts of North and South America
Ecological Impact Extinction of Anchovy, Cause to serious decrease 4
of the many fish population, pollution in the sea
Reproduction Rate and Invasive bottom after they die. 4
Potential 4
Invaded Regions Adult ones can produce 2000-8000 eggs during 3
spawning, very high invasive potential 15
Management Difficulty
Black Sea, Mediterranean Sea, Marmara Sea,
Aegean Sea
Can be controlled with significant ongoing
management
Ecological Impact Score
Frequency factor for Mnemiopsis leidyi determined as described,
Total Amount of Ballast Water Carried from Native Seas
F.F = —————————————————————————
Total Amount of Ballast Water Carried from All Seas
B.W from South Atlantic + B.W from Northwest Atlantic
F.F = —————————————————————————
Total Amount of Ballast Water Carried from All Seas
3745481 tones
F.F = ————————————————————————— = 0, 28
13581202 tones
Risk index for Mnemiopsis leidyi determined as;
Risk Index = Ecological Impact Factor × Frequency Factor
Risk Index = 15 x 0,28 = 4,20
Mnemiopsis leidyi was first discovered in the Black Sea in 1982[5]. However the invasive comb
jelly reached its maximum population at the end of the 80s and preyed on planktonic organisms,
larvae and eggs of native fishes which are exposed the risk of extinction. Mnemiopsis leidyi
GiDB|DERGi Sayı 5, 2016
