In the residential area of the North Coast of the Persian Gulf, consumption of fish is a possible source of exposure to heavy metals and other pollutants, all of which may act as potential risk factors for serious syndromes and fatal diseases. Health risks associated with Pb, Cd, and Hg were assessed based on the target hazard quotients (THQ), which can be derived from concentrations of heavy m...

A bioenergetic model for two narwhal (Monodon monoceros) sub-populations was developed to quantify daily gross energy requirements and estimate the biomass of Greenland halibut (Reinhardtius hippoglossoides) needed to sustain the sub-populations for their 5-month stay on wintering grounds in Baffin Bay. Whales in two separate wintering grounds were estimated to require 700 tonnes (s.e. 300) and...

Currently, it is assumed that eastern Pacific halibut Hippoglossus stenolepis belong to a single, fully mixed population extending from California through the Bering Sea, in which adult halibut disperse randomly throughout their range during their lifetime. However, we hypothesize that hali but dispersal is more complex than currently assumed and is not spatially random. To test this hypo thesi...

The Alaskan and British Columbian fishery for Pacific halibut has undergone substantial restructuring over the last decade from a regulated open-access no-holds-barred derby that largely relied on frozen inventories to satisfy market demand to a slow-paced individual quota-based fishery that has reorganized supply chains to deliver high-quality fresh product throughout a protracted season. We h...

We studied the learning capacities and anticipatory behaviour in a "sit-and-wait" predatory fish, the Atlantic halibut, Hippoglossus hippoglossus. In Experiment 1 two groups of halibut received series of light flashes (conditioned stimulus, CS) that started before delivery of food (unconditioned stimulus, US) and persisted until after food delivery, i.e. delay conditioning. Control groups recei...

In fi shery applications of tag-recovery models, recovery probabilities are typically parameterised in terms of instantaneous rates of mortality, where the mortality rate can be a function of the size or age of a fi sh. For age-dependent tag-recovery models, past work on Pacifi c halibut used a fi xedage approach, in which the age of each fi sh was fi xed at the same value for each halibut of a...

The East Coast of Sumatra is protected from the fierceness Indian Ocean. number rivers that flow makes coastal waters have high nutrients. Rupat Strait one central areas for catching shrimp using sondong fishing gear. This study aims to determine and inform composition catch (amount type) rate gear in Pangkalan Sesai Village, West Dumai District, City, Riau Province. Data collection was carried...