Elasmobranch populations are declining worldwide, calling for urgent assessment of fishery exploitation and application of effective conservation strategies. Here, we applied a novel approach, integrating long-term time-series of landings (1945 –2012) and extensive surveys at the fish market of Chioggia, Italy, home of the major fishing fleet of the northern Adriatic Sea, to evaluate the status of elasmobranch populations and fisheries in the one of the most fished Mediterranean basins. The time-series highlight a dramatic decline in elasmobranch landings, particularly for skates and catsharks (Scyliorhinus spp.), whose current catch rates are 2.4 and 10.6% of the average 1940s levels, respectively. These data likely reflect similar large reductions in abundance, as indicated by the analysis of catch-per unit-effort timeseries. The biomass of landed skates and catsharks showed regular fluctuations that disappeared after the collapse of the landings. Elasmobranch market composition, assessed through the sampling of 11 900 specimens from 2006 to 2013, included 14 species, but was dominated by just two: Mustelus mustelus and M. punctulatus, which represented more than 60% of the catch. The proportion of sexually immature individuals was generally very high, up to 83% of landed females and 71% of landed males, depending on the species. Although some correlations were detected between landings and local hydrography or climatic indices, the analyses of landings and surveys at the fish market identified fishery exploitation as the main driver of the striking, long-term elasmobranch decline in the northern Adriatic Sea, calling for urgent management actions to improve the conservation status of these fish.

/pdf/the-role-of-fisheries-and-the-environment-in-driving-the-3e0ms32s0g.pdf

The role of fisheries and the environment in driving the decline of elasmobranchs in the northern Adriatic Sea

Seasonal variations of dissolved organic matter in the northern Adriatic Sea

The aim of the presented study was to evaluate the suitability of textile mill wastewater (treated and untreated) at different concentrations (0, 6.25, 12.5, 25, 50, 75, and 100%) for irrigation purposes. Effect of textile mill wastewater on germination, delay index, physiological growth parameters and plant pigments of two cultivars of sorghum was studied. The textile effluent did not show any inhibitory effect on seed germination at lower concentration (6.25%). The other reported plant parameters also followed the similar trend. Seeds germinated in 100% effluents but did not survive for longer period. It has also been concluded that effect of the textile effluent is cultivar specific and due care should be taken before using the textile mill wastewater for irrigation purpose.

Influence of textile mill wastewater irrigation on the growth of sorghum cultivars

https://bib.irb.hr/datoteka/508647.1-s2.0-S0079661111001297-main_Berline_et_al_2012.pdf

Intercomparison of six Mediterranean zooplankton time series

http://doga.ogs.trieste.it/doga/echo/eo/pdf/1998Allen_Blackford_Radford.pdf

An 1-D vertically resolved modelling study of the ecosystem dynamics of the middle and southern Adriatic Sea

Year-to-year fluctuations in the abundance of zooplankton (1960-1982) and bacteria (1968-1988) were examined. Three main patterns of year-to-year changes in abundance were extracted by Principal Component Analysis (PCA): (1) Cyclical oscillations with 5.5 yr periodicity. This pattern is well correlated with salinity and southerly weather type (lower atmospheric pressure, southeasterly wind and higher precipitation) and can be accounted for by the water exchange between the Mediterranean and the Adriatic Sea. (2) Long-term trend of increasing abundance presumably due to the open Adriatic eutrophication. (3) Oscillations with 7.3 yr periodicity. This pattern is well correlated with temperature.

https://www.int-res.com/articles/meps/92/m092p065.pdf

Temporal fluctuations of zooplankton and bacteria in the middle Adriatic Sea

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Temporal fluctuations of zooplankton and bacteria in the middle Adriatic Sea