Squatina Squatina)

Table 1. Mediterranean International Trawl Survey (MEDITS) data for Squatina species. Catches Period Research Programme Species (n. ind.) Regularly Montanelli 2016 – la pesca in Toscana sold at 1500-1800 Squatina spp. fra il XVI e il XIX secolo the fish market 1898-1905 Tonnarella di Baratti – high Tyrrhenian 134 Squatina spp. 1906-1913 Tonnarella di Baratti – high Tyrrhenian 95 Squatina spp. 1914-1922 Tonnarella di Baratti – high Tyrrhenian 15 Squatina spp. 1958 MATTA – coastal area 0 Almost 1965 Tortonese S. squatina (+S. aculeata) common 1972-1974 MATTA – deep area 10 S. squatina 1972-1975 MATTA – deep area 11 S. aculeata 1977-1981 Oceanografia e Fondi Marin 0 1982-1983 MMM-Tre miglia – Italian seas 0 GRUND high Tyrrhenian and Ligurian 1985-2000 0 seas MEDITS high Tyrrhenian and Ligurian 1994-2017 0 seas 1996 MEDITS – North Corsica 1 S. squatina 1996 MEDITS - Creta 1 S. aculeata 1999 GRUND – South Sicily 1 S. squatina 2009-2010 ELASMOIT – GSA19 1 S. squatina 2014 ELASMOSTAT – GSA16 1 Squatina spp. 2011 Guisto & Ragonese (2014)1 1 S. squatina 2007 Zava et al. (2016)2 4 S. aculeata 1 Giusto, G. B. and Ragonese, S. 2014. Finding of the almost disappeared angel shark (Squatina squatina, Linnaeus, 1758) (Chondrichthyes: Squatinidae), off the south coasts of Sicily (Mediterranean Sea). Naturalista Siciliano: 113–114. 2 Zava, B., Fiorentino, F., and Serena, F. 2016. Occurrence of juveniles Squatina oculata Bonaparte, 1840 (Elasmobranchii : Squatinidae) in the Strait of Sicily (Central Mediterranean Sea). Cybium, International Journal of Ichthyology, 1840: 341–343.

THE IUCN RED LIST OF THREATENED SPECIES™

Figure 1. Trend of Squatina spp. catches in the North Tyrrhenian and Ligurian seas in the last two centuries.

2a 2b 2c Figure 2. Summaries of elasmobranch data from the Upper Tyrrhenian Sea; for details, see Ferretti et al. 2005. 2a – Instantaneous rate of change in abundance for shark species occurring in depths between 200 and 800 meters (segments refer to 95% Wald confidence intervals of the parameter estimates for the year effect); 2b – Rates of change in abundance per year (1904-1922) of six demersal elasmobranchs occurring in the fish trap of Baratti (horizontal segments at the end of the bars correspond to 95% confidence interval of the relative rates); 2c – Estimated trends over time of Squatina species occurring in fishtraps of Baratti from 1898 to 1922 (continuous lines represent predicted values from a linear model; dotted lines represent predicted values from a quadratic model; points are yearly means of the monthly production). Data source: Ferretti, F., Myers, R.A., Sartor, P. and Serena, F. 2005. Long term dynamics of the chondrichtyan fish community in the Upper Tyrrhenian Sea. ICES CM 2005/N:25. Available at http://www.ices.dk/sites/pub/CM%20Doccuments/2005/N/N2505.pdf.