Mercury (Hg) was determined in Thunnus albacares canned in oil (from 7 to 10 samples per brand) and water (from 5 to 10 samples per brand) of five leading brands in Mexico in 2008. Potential health risk was estimated on the basis of Hg concentration and rate (1.43 kg year(-1)per capita) of tuna consumption in Mexico. Highest Hg concentrations were 0.51 ± 0.26 and 0.40 ± 0.24 μ gg(-1) dry weight...

the objective of this study was to produce fish peptone from tuna (thunnus tonggol) viscera, by alcalase. response surface methodology (rsm) was employed for optimizing the temperature and ph. hydrolysis was done in different tempratures (50-65˚c) , ph (8-8. 5) and selected 13 treatments. samples with higher value of protein were used instead of the standard peptones which applied in commercial...

Predatory fishes, such as tunas, billfishes, and sharks, coexist in pelagic regions of the tropical oceans. In situ experiments have revealed horizontal and vertical movement patterns for different pelagic species, but the influence of the biotic environment on movement behaviour has not been studied. In this paper, we propose a simple model in which the movement behaviour of these fishes is dr...

In tuna farming, turbidity measurement is highly important since one of the cause of death of tuna is a choking death due to muddy water. In this paper, we consider to use visible light communication modules for estimation of turbidity in underwater environments. If these modules can be used as turbidity meters, additional introduction of dedicated turbidity meters is not necessary. In this pap...

Fish is a highly nutritious food, but it can also be a dietary source of persistent organic pollutants (POPs). In a new study in EHP, researchers investigated the extent to which contaminant levels within a single commercially important fish species varied depending on where the fish was caught. Their results suggest that capture location may be an important yet overlooked variable when assessi...

A simple and rapid ultrasound assisted extraction (UAE) protocol with dilute solutions of tetramethylammonium hydroxide (TMAH) for the speciation of mercury in fish and plant tissues was developed as an alternative to conventional methods which require intensive treatments. The main operational parameters, such as extractant concentration (TMAH), sonication time and amount of sample, were optim...

BACKGROUND The aim of this paper was to study the prevalence and intensity of Anisakids larvae in the long tail tuna fish captured from Iranian shores of Persian Gulf. METHODS Different organs including skin, abdominal cavity, stomach and intestinal contents, stomach sub serous tissues, liver, spleen, gonads and 20 grams of muscles of 100 long tail tuna fish (Thannustonggol) caught from water...

The paper reviews existing allocation mechanisms in the five tuna regional fisheries management organizations and shows that although they have adopted different approaches all have failed to prevent overcapacity and, for some stocks, overexploitation. As an alternative, it is proposed that each tuna regional fishing management organization establish total allowable catches by species and area,...

Mark Schrope Science Writer Growing up on the tropical island of Jamaica, it’s not surprising that Guy Harvey developed a love for the sea and fishes early on or that he would choose a career based on their study. However, his passions led him down a decidedly unorthodox path for a fisheries biologist. Harvey built a marine art empire that has put shirts depicting marlins, sharks, and other ope...

The development of neural multifunctionality - given brain regions carrying out more than one function - conferred great efficiency on brain function at early stages of evolution. This applied to animals that led relatively simple lives with few needs for long-term memories, such as many lower invertebrates - many molluscs, echinoderms, worms, etc. As more complex lifestyles and detailed focal ...