Gill net and long-line catch comparisons in a hake fishery: the case of southern Portugal

How does the northern Mediterranean population of Helicolenus dactylopterus dactylopterus resist fishing pressure?

“…It is a typical sitand-wait predator with a highly cryptic colouration (Uiblein et al, 2003) that appears as a by-catch in the bottom trawl fisheries targeted at deep-water crustaceans (Bauchot, 1987). On the non-trawling slope bottoms it is caught using more selective gears like long-lines or gillnets (Bauchot, 1987;Lloris and Meseguer, 2000;Santos et al, 2002).…”

Ontogenetic allometry of the bluemouth, Helicolenus dactylopterus dactylopterus (Teleostei: Scorpaenidae), in the Northeast Atlantic and Mediterranean based on geometric morphometrics

“…Another way to avoid size effects would be to compare samples with similar size compositions or to only use fish of the same size (selective sampling). However, for demersal species like the bluemouth, it is not easy to obtain homogeneous samples from all of the study areas because most of the time, sampling depends on fisheries that target other species (e.g., European hake, Merluccius merluccius, or Blue and red shrimp, Aristeus antennatus), and the size range of the captured specimens in each area can be affected by factors such as depth and the type of bottom of the fishing area and the fishing gear used (i.e., trawling nets, long-lines or gill-nets) (Demestre et al, 2000;Massutí et al, 2001;Santos et al, 2002). In addition, bluemouth samples from trawling research surveys also vary in size composition, as in this study.…”

“…Although there has been little commercial interest in this species, partially due to its low level of accessibility, it is currently of growing commercial interest as new resources need to be found by fishing fleets because of the depletion of traditional resources. This species is caught by artisanal longline and gillnet fisheries near the Strait of Gibraltar and along the Portuguese continental coast and the Azores (Esteves et al, 1997;Santos et al, 2002;Czerwinski et al, 2008). In the western Mediterranean, bluemouth are mostly caught as by-catch in bottom trawl fisheries targeted at deep-sea crustaceans Sánchez et al, 2004).…”

Composición de especies en la pesquería artesanal de enmalle de merluza común Merluccius gayi gayi en Chile central

“…Cada especie fue clasificada según su frecuencia relativa de ocurrencia (fro= frecuencia de ocurrencia/número de lances) en 4 categorías conforme a lo descrito por Santos et al (2002): i) R= especies raras (So < 0,25), ii) U= especies poco comunes (0,25 ≤ So < 0,50), iii) C= especies comunes (0,50 ≤ So < 0,75) y iv) V= especies muy comunes (So ≥ 0,75).…”