Escape Survival and Scale Damage Assessment of Red Mullet (Mullus barbatus Linnaeus, 1758) during Bottom Trawling in the Central Mediterranean Sea

Abstract

Stock assessments routinely evaluate the status of commercially harvested species, but seldom account for the possible mortality of released or escaping fish. This study presents a method for estimating the escape survival of the red mullet (Mullus barbatus) from demersal trawling in the Central Mediterranean Sea. Fish escaping from the trawl codend were collected in a detachable cage, which was lined to reduce water flow and protect the sampled fish from further fatigue and injury. Control fish (from an open codend) showed high survival, 94% (87–97%, 95% Confidence Interval), and minimal injuries, while fish escaping through codend meshes had significantly increased injuries and reduced survival, 63% (55–70%). During 7 days of captive monitoring, treatment group mortality was highest in the first 24 h and ceased for both groups within 48 h. Conflicting length-related mortality was observed, where larger treatment fish had a higher probability of dying, while the opposite was observed in the controls. Analysis showed that treatment fish were significantly more injured than control fish, with treatment fish predominantly injured in the head zone. In conclusion, this improved methodology should be repeated to provide accurate escape mortality estimates for the improved stock assessment of the red mullet in the Central Mediterranean.

A Rarely Reported Crustacean Species, Rissoides pallidus (Giesbrecht, 1910) (Stomatopoda, Squillidae), Caught in the Strait of Sicily Waters (Central Mediterranean Sea)

“…On December 2020, two specimens of R. pallidus (trawl haul points: 37.515 • N, 12.4025 • E and 37.493 • N, 12.4433 • E) were captured as part of the discarded fraction during a trawl survey carried out off the Mazara del Vallo harbor (northern sector of the Strait of Sicily). The purpose of the trawl survey was to collect information about gear selectivity in the deep-water rose shrimp (Parapenaeus longirostris Lucas, 1846) fishery, which employed the typical Italian commercial trawl net with a codend of 40 mm square mesh [22,23]. Thereafter, we identified the species and collected biometric data of R. pallidus specimens at the laboratory of CNR-IRBIM of Mazara del Vallo.…”