Table 1 in Handbook of Freshwater Fishes of West Asia

Table 1. Summary of the five criteria (A–E) used to evaluate if a species belongs in a category of threat (Critically Endangered, Endangered, or Vulnerable) (from IUCN 2001). Use any of the criteria A–ECritically EndangeredEndangeredVulnerableA. Population reduction Declines measured over the longer of 10 years or 3 generationsA1>90 %>70 %>50 %A2, A3, A4>80 %>50 %>30 %A1. Population reduction observed, estimated, inferred, or suspected in the past where the causes of the reduction are clearly reversible AND understood AND ceased based on and specifying any of the following:(a) direct observation(b) an index of abundance appropriate to the taxon(c) a decline in AOO, EOO, and/or habitat quality(d) actual or potential levels of exploitation(e) effects of introduced taxa, hybridisation, pathogens, pollutants, competitors, or parasites.A2. Population reduction observed, estimated, inferred, or suspected in the past where the causes of reduction may not have ceased OR may not be understood OR may not be reversible, based on (a) to (e) under A1.A3. Population reduction projected or suspected to be met in the future (up to a maximum of 100 years) based on (b) to (e) under A1.A4. An observed, estimated, inferred, projected, or suspected population reduction (up to a maximum of 100 years) where the time period must include both the past and the future and where the causes of reduction may not have ceased OR may not be understood OR may not be reversible, based on (a) to (e) under A1.B. Geographic range in the form of either B1 (extent of occurrence) OR B2 (area of occupancy)B1. Extent of occurrence<100 km²<5000 km²<20,000 km²B2. Area of occupancy and 2 of the following 3:<10 km²<500 km²<2000 km²(a) Severely fragmented or # locations=1<5<10(b) Continuing decline in any of: (i) extent of occurrence; (ii) area of occupancy; (iii) area, extent, and/or quality of habitat; (iv) number of locations or subpopulations; (v) number of mature individuals(c) Extreme fluctuations in any of: (i) extent of occurrence; (ii) area of occupancy; (iii) number of locations or subpopulations; (iv) number of mature individualsC. Small population size and declineNumber of mature individuals<250<2500<10,000and either C1 or C2:C1. An estimated continuing decline of at least:25 % in 3 years20 % in 5 years10 % in 10 yearsup to a maximum of 100 yearsor 1 generationor 2 generationsor 3 generationsC2. A continuing decline and (a) and/or (b):(a i) # mature individuals in all sub-populations:<50<250<1000(a ii) or % individuals in one sub-population at least90 %95 %100 %(b) extreme fluctuations in the number of mature individualsD. Very small or restricted populationEither:(1) number of mature individuals<50<250<1000OR(2) restricted area of occupancynanaAOO <20 km² or # of locations <5E. Quantitative analysisIndicating the probability of extinction in the wild to be at least:50 % in 10 years or 3 generations (100 years max)20 % in 20 years or 5 generations (100 years max)10 % in 100 years