1. Plaice caught by trawl net and plaice exercised in laboratory tanks all show high levels of lactic acid (33--44 mmol/kg) in the anaerobic swimming muscle. During exhausting exercise 2 moles of lactate are formed from 1 mole of glycogen glucose. After an 8 h rest 50--80% of the muscle glycogen is restored. 2. Blood lactate levels remain low (0.5--2 mmol/l) in the majority of plaice caught by ...

Plasma corticosterone concentrations were measured in wild loggerhead sea turtles (Caretta caretta) in response to acute captivity (capture, serial bleeding, and restraint up to 6 hr). In general, concentrations of corticosterone dramatically increased 1 hr after capture, peaked at 3 hr, and decreased by 6 hr. Initial corticosterone concentrations were significantly lower in animals captured by...

Catch monitoring during demersal trawling is important to help fishers around the globe cope with high bycatches. Information about catch composition towing will allow identify and react presence of unwanted undertake actions avoid them trawling. In trawl fisheries, by optical devices typically challenged poor quality underwater observations due sediment mobilized process. this study we develop...

In the U.S. West Coast groundfish bottom trawl fishery, Pacific halibut (Hippoglossus stenolepis) bycatch can impact some fishers’ ability to fully utilize their quota shares of groundfishes. this study, we compared catch efficiency for and four commercially important species between an illuminated non-illuminated trawl. The caught significantly fewer sablefish than For Dover sole (Microstomus ...

AbstractSmall-scale fishers’ short-run supply decisions are understudied, often because of data limitations. We utilize a unique dataset daily catches and prices from mixed-species trawl fishe...

Reducing fleet capacity in European fisheries is an important objective of the European Union’s Common Fisheries Policy. The success of such programmes depends both on the variation and the level of efficiency within the fishing fleets. If vessels with significantly lower than average efficiency levels are decommissioned, the actual reduction in fishing capacity will be less than expected. Furt...

According to ICES, the International Council for the Exploration of the Sea, populations of coastal cod (CC) in Norway north of 628N have been declining since 1994. The estimates are based on analytical assessment in which the most recent estimates are tuned with survey information. We evaluate the quality of bottom-trawl surveys conducted in four North Norwegian fjords during autumn of the yea...

Camera-based fish abundance estimation with the aid of visual analysis techniques has drawn increasing attention. Live fish segmentation and recognition in open aquatic habitats, however, suffers from fast light attenuation, ubiquitous noise and non-lateral views of fish. In this chapter, an automatic live fish segmentation and recognition framework for trawl-based cameras is proposed. To mitig...

Measures of biological diversity (biodiversity) are important for monitoring the state ecosystems. Several indices and methods used to describe biodiversity from field observations. Marine faunal is often quantified based on analysis samples collected using a trawl during research surveys. To monitor spatial temporal changes in between surveys, generally series stations. Inference regarding mus...

The density of neustonic plastic particles was compared to that of zooplankton in the coastal ocean near Long Beach, California. Two trawl surveys were conducted, one after an extended dry period when there was little land-based runoff, the second shortly after a storm when runoff was extensive. On each survey, neuston samples were collected at five sites along a transect parallel to shore usin...