maximios

A double codend was compared to the standard codend in the Clarence River penaeid trawl fishery in southeastern Australia, to determine its effects on total catch, retained and discarded school prawns, sizes of discarded prawns, discarded fish and immediate and short-term mortalities of discarded juvenile school prawns.  The only significant difference between gear types was […]

Brcic, J., Herrmann, B., De Carlo, F. and Sala, A., Selective characteristics of a shark-excluding grid device in a Mediterranean trawl, Fisheries Research , v. 172, 2015 , ps 352-360 Brewer, D., Heales, D., Milton, D., Dell, Q., Fry, G., Venables, B., Jones, P., The impact of turtle excluder devices and bycatch reduction devices on […]

Visual cues are important in sea turtle foraging behavior and likely influence their interaction with fishing gear. This studey examined the potential effectiveness of three visual cues: 1) shark shapes, 2) illumination of nets by LED lights, and 3) nets illuminated with chemical lightsticks – for reducing green sea turtle bycatch in gillnets. The presence […]

The use of light torilines (made with nylon monofilament branch lines and streamers made from other light material) on pelagic longlines reduced the incidental capture of seabirds by 64%. The capture of target species, including swordfish and blue sharks, was increased by 32% and 15.1% respectively when light torilines were used.

A study was conducted aboard vessels from the South Australian Spencer Gulf prawn fishery to examine the utility of a mechanical-separating bycatch reduction device. The fishery targets prawns but has bycatch of giant cuttlefish (Sepia apama) and blue swimmer crabs (Portunus armatus). Conventional codends were tested against small and large Nordmore-grids set at high and […]

The experiment evaluated the effectiveness of two types of pingers (Aquamark 100 and Aquamark 200) to reduce the bycatch rate of harbor porpoise (Phocoena phocoena) in a set gillnet fishery in the Black Sea. The study also evaluated the effects of the pingers on catch of target and non-target fish species. There was no significant […]

This is a comprehensive, critical overview of studies on the use of electrotrawling in the North Sea. Electrotrawling, involves replacing the tickler chains or bobbins with electrical stimulation. The result is reduced contact with bottom habitats, reduced fuel costs and reduced discards. An overview on the current status and implementation of this technique in flatfish, […]

Wisconsin-type fyke nets were modified in an effort to reduce the incidental bycatch of turtles, without significantly reducing the catch of targeted fish species.  The tests were conducted in three rivers (Missouri, Mississippi and Gasconade) in Missouri.  The net was modified by adding four lines in the vertical gap of the net and this modification […]

The authors conducted an extensive literature review to determine if Sea Lion Excluder Devices (SLEDs) allow sea lions to escape from trawl nets and if they subsequently survived. In addtion, the literature was reviewed to determine if head trauma was likely when sea lions come into contact with stainless steel SLED grids. According to the […]

The focus of this study was to compare two selective devices in a trawl by automated counting of fish escapements through each selective device (a white and black square mesh panel) based on video sequencing and an algorithm for automated object detection and tracking. The software detected a significant difference in fish escapement rate according […]

Broadhurst, M.K., Millar, R.B., Uhlmann, S.S., Using a double codend to reduce discard mortality, ICES Journal of Marine Science , v. 66, 2009 , ps 2077-2081 Broadhurst, M.K., Smith, T.M., Millar, R.B., Hughes, B., Raoult, V., and Gaston, T.F., Cumulative selectivity benefits of increasing mesh size and using escape gaps in Australian Portunus armatus traps, […]

The selectivity of the Skagerrak standard trawls were compared with a trawl differing only in the belly length, being 37% shorter. The trawls fished shrimp above 19 mm carapace length equally, while catch rates of shrimp below 15.5–16 mm carapace length in the shorter trawl were more than halved. Bycatch of Norway pout (Trispterus esmarkii) was […]

In south-eastern Australia, baited, round traps (comprising 50–57-mm mesh netting) are used to target giant mud crabs (Scylla serrata) and blue swimmer crabs (Portunus armatus) in spatially separated fisheries.  Two experiments assessed the utility of (1) traps partially or completely covered in larger mesh (91 mm to match the minimum legal size of the smaller P. armatus), and (2) […]

Small cetaceans are by-caught in salmon gillnet fisheries in British Columbia (BC) waters. In Canada, there is currently no generic calculation to identify when management action is necessary to reduce cetacean bycatch below sustainable limits. We estimated potential anthropogenic mortality limits for harbour (Phocoena phocoena) and Dall’s (Phocoenoides dalli) porpoises and Pacific white-sided dolphins (Lagenorhynchus […]