Organic and total mercury in muscle tissue of five aquatic birds with different feeding habits from the SE Gulf of California, Mexico

Chemosphere ◽  
2009 ◽  
Vol 76 (3) ◽  
pp. 415-418 ◽  
Author(s):  
J. Ruelas-Inzunza ◽  
J. Hernández-Osuna ◽  
F. Páez-Osuna
Keyword(s):  
Muscle Tissue ◽  
Gulf Of California ◽  
Total Mercury ◽  
Feeding Habits ◽  
Aquatic Birds

Assessment of caudal fin clip as a non-lethal technique for predicting muscle tissue mercury concentrations in largemouth bass

2008 ◽  
Vol 5 (3) ◽  
pp. 200 ◽  
Author(s):  
S. A. Ryba ◽  
J. L. Lake ◽  
J. R. Serbst ◽  
A. D. Libby ◽  
S. Ayvazian
Keyword(s):  
Rhode Island ◽  
Muscle Tissue ◽  
Largemouth Bass ◽  
Total Mercury ◽  
Micropterus Salmoides ◽  
Mercury Contamination ◽  
Caudal Fin ◽  
Minimal Impact ◽  
Fish Consumption Advisories ◽  
Relationship Of

Environmental context. In the development of fish consumption advisories, fisheries biologists routinely sacrifice fish and analyse muscle fillets in order to determine the extent of mercury contamination. Such lethal techniques may not be suitable for endangered species or limited fish populations from smaller-sized water bodies. We compared the measured total mercury concentrations in tail fin clips to that of muscle fillets and illustrated that tail fin clips may be used as an accurate tool for predicting mercury in muscle tissue. This is the first study on the use of tail fin clips to predict mercury levels in the muscle tissue of largemouth bass with minimal impact on the fish. Abstract. The statistical relationship between total mercury (Hg) concentration in clips from the caudal fin and muscle tissue of largemouth bass (Micropterus salmoides) from 26 freshwater sites in Rhode Island, USA was developed and evaluated to determine the utility of fin clip analysis as a non-lethal and convenient method for predicting mercury concentrations in tissues. The relationship of total Hg concentrations in fin clips and muscle tissue showed an r2 of 0.85 and may be compared with an r2 of 0.89 for Hg concentrations between scales and muscle tissue that was determined in a previous study on largemouth bass. The Hg concentration in fin clip samples (mean = 0.261 μg g–1 (dry)) was more than a factor of twenty greater than in the scale samples (mean = 0.012 μg g–1 (dry)). Therefore, fin clips may be a more responsive non-lethal predictor of muscle-Hg concentrations than scale in fish species which may have reduced Hg concentrations.

Trophic ecology of the chihuil sea catfish (Bagre panamensis) in the south-east Gulf of California, México

2017 ◽  
Vol 98 (4) ◽  
pp. 885-893 ◽  
Author(s):  
Víctor M. Muro-Torres ◽  
Felipe Amezcua ◽  
Raul E. Lara-Mendoza ◽  
John T. Buszkiewicz ◽  
Felipe Amezcua-Linares
Keyword(s):  
Gulf Of California ◽  
Trophic Ecology ◽  
Trophic Position ◽  
Feeding Habits ◽  
Isotope Analysis ◽  
Demersal Fish ◽  
Trophic Levels ◽  
High Plasticity ◽  
Combined Use ◽  
Ecosystem Based Fisheries Management

The trophic ecology of the chihuil sea catfish Bagre panamensis was studied through high-resolution variations in its feeding habits and trophic position (TP) in the SE Gulf of California, relevant to sex, size and season. The combined use of stomach content (SCA) and stable isotope analysis (SIA) allowed us to perform these analyses and also estimate the TP of its preys. Results of this study show that the chihuil sea catfish is a generalist and opportunistic omnivore predator that consumes primarily demersal fish and peneid shrimps. Its diet did not vary with climatic season (rainy or dry), size or sex. Results from the SIA indicated high plasticity in habitat use and prey species. The estimated TP value was 4.19, which indicates a tertiary consumer from the soft bottom demersal community in the SE Gulf of California, preying on lower trophic levels, which aids in understanding the species' trophic role in the food web. Because this species and its prey are important to artisanal and industrial fisheries in the Gulf of California, diet assimilation information is useful for the potential establishment of an ecosystem-based fisheries management in the area.

Distribution of Mercury in the Sediments and Fishes of the Lagoon of Aveiro, Portugal

1986 ◽  
Vol 18 (4-5) ◽  
pp. 141-148 ◽  
Author(s):  
M. F. Lucas ◽  
M. T. Caldeira ◽  
A. Hall ◽  
A. C. Duarte ◽  
C. Lima
Keyword(s):  
Coastal Waters ◽  
Total Mercury ◽  
Feeding Habits ◽  
Sediment Concentration ◽  
Point Sources ◽  
The Other ◽  
Ecological Niches ◽  
Ongoing Work ◽  
Superficial Sediments ◽  
Significant Point

Dry and wet sieving were compared on their suitability for the size fractionation of bottom sediment samples, collected from a brackish water, coastal lagoon, prior to flameless atomic absorption analysis of the sediment concentration of total mercury. The work aimed at identifying the most important point sources of mercury to the lagoon waters and at assessing the distribution, throughout the ecosystem, of the mercury discharged. The results reported in this paper refer to the lagoon sediments and fishes. Ongoing work is extending the survey to the other inland ecological niches and to the coastal waters and sediments. A chlor-alkali plant proved to be the most important source of mercury but its contribution has not yet been disentangled from those originating at a pyrite roasting facility and a PVC factory operating in the same industrial park. Sewage discharges from the bankside communities are the other significant point sources of Hg. Concentrations of Hg in the superficial sediments ranged from 850 mgkg−1, near the chlor-alkali sewer outlet, to 0.05 mgkg−1 in the intertidal sands of the coastal beaches. Sewage-affected sediments have concentrations of Hg in the range of 1 to 2 mgkg−1. The concentrations observed in the water samples and superficial sediments suggest that some of the Hg historically discharged into the lagoon may have been exported to the Atlantic Ocean coastal waters. Bioaccumulation of Hg in fish tissues shows the usual dependence on species, territoriality, feeding habits and size. Concentrations as high as 25 mgkg−1 fresh weight have been observed but the average values do not exceed the EEC quality objective of 0.3 mgkg−1 (EEC, 1982).

Mercury and selenium concentrations in sharks from northern Australian waters

1986 ◽  
Vol 37 (3) ◽  
pp. 309 ◽  
Author(s):  
JM Lyle
Keyword(s):  
Muscle Tissue ◽  
Total Mercury ◽  
Fork Length ◽  
Selenium Concentration ◽  
Size Composition ◽  
Mercury Content ◽  
Sphyrna Lewini ◽  
Weighted Means ◽  
Wet Weight ◽  
Function Relationship

Total mercury, alkyl mercury and selenium concentrations in the muscle tissue of 15 carcharhinid (Carcharhinus sp., C. limbatus, C. sorrah, C. fitzroyensis, C. amblyrhynchoides, C. melanopterus, C. cautus, C. amboinensis, C. macloti, C. dussumieri, C. brevipinna, Rhizoprionodon acutus, R. taylori, Galeocerdo cuvieri, Negaprion acutidens) and three hammerhead (Sphyrna lewini, S. mokarran and S. blochii) sharks from northern Australian waters are reported. Total mercury concentrations ranged widely with maximum individual concentrations exceeding 1.5 mg kg-1 wet weight in 11 species and values of over 3.0 mg kg-1 in Carcharhinus sp., C. amblyrhynchoides, C. melanopterus, C. amboinensis and S. mokarran. Much of the variability in total mercury concentration was attributable to differences in length. Total mercury was adequately correlated with fork length by the power function relationship. There were signficiant differences in these relationships for males and females of six species: males had higher concentrations of mercury than females of the same size. Weighted mean mercury concentrations were calculated using species and size composition data from commercial feasibility fishing trials. Weighted means for species other than C. sorrah, C. macloti, C. brevipinna and C. dussumieri were greater than 0.5 mg kg-1 and the value for the combined catch of all species was 1.22 mg kg-1. Alkyl mercury comprised over 80% of the total mercury content in the muscle tissue. Maximum individual selenium concentrations were greater than 1.0 mg kg-1 in nine species and the maximum concentration recorded was 3.4 mg kg-1 for C. dussumieri. There were no obvious or consistent relationships between selenium concentration and fork length or between selenium and mercury concentrations.

scholarly journals Mercury in Pelecanus occidentalis of the Cispata bay, Colombia

2014 ◽  
pp. 4168-4174 ◽  
Author(s):  
Saudith Burgos N ◽  
José Marrugo N ◽  
Amado Navarro F ◽  
Ivan Urango C
Keyword(s):  
Organic Matter ◽  
Atomic Absorption ◽  
Total Mercury ◽  
Feeding Habits ◽  
Total Concentration ◽  
Cold Vapor ◽  
Non Invasive ◽  
The Sacrifice ◽  
Pelecanus Occidentalis ◽  
Vapor Method

ABSTRACTObjective. Assessment the total concentration of mercury in the liver and feathers of Pelecanus occidentalis of the Cispata bay, Colombia. Materials and methods. Mercury concentrations in liver and feather of Pelecanus occidentalis residents in the Cispata bay – Colombia were evaluated by digestion with an acidic mixture of H2SO4–HNO3 and KMnO4 to eliminate organic matter. The concentration of mercury was determined by the Atomic Absorption - Cold Vapor method (CVAAS). Results. Total mercury levels found in this study were higher in feathers (0.31-9.17 mgHg/kg) than in the liver (0.63–6.29 mgHg/kg), being higher than those reported in other seabirds studies. Conclusions. The high levels of total mercury in feathers and liver can be explained by the feeding habits of the organisms under study, showing the utility of feathers as a potential non-invasive tool for the monitoring of the ecosystem and thereby preventing the sacrifice of specimens

scholarly journals Feeding habits of the spotted rose snapper, Lutjanus guttatus, (Actinopterygii, Perciformes, Lutjanidae), in the central Gulf of California, BCS, Mexico

2021 ◽  
Vol 51 (1) ◽  
pp. 95-105
Author(s):  
Filius L. Valle-Lopez ◽  
Xchel G. Moreno-Sánchez ◽  
Marina S. Irigoyen-Arredondo ◽  
Leonardo A. Abitia-Cárdenas ◽  
Emigdio Marín-Enríquez ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Trophic Ecology ◽  
Feeding Habits ◽  
Feeding Strategy ◽  
Trophic Niche ◽  
Trophic Plasticity ◽  
Important Prey ◽  
Management Measures ◽  
Reported Study ◽  
Santa Rosalia

The spotted rose snapper, Lutjanus guttatus (Steindachner, 1869), is an important resource for the coastal fisheries of the Gulf of California, mainly due to its high commercial value. Despite this, there are no management measures for this species, owing in part to a lack of information on its basic biology and its trophic ecology in the area. In this context, the presently reported study had as objective to describe the feeding habits of L. guttatus through stomach content analyses, as well as to describe possible changes linked to sex, size, and season. Specimens were caught monthly from June 2016 to September 2017 with gillnets in Santa Rosalía, BCS, Mexico. The abundance, weight, and frequency of occurrence of each prey were assessed, and these parameters were integrated into the index of relative importance (%IRI) to determine the importance of each prey item in the L. guttatus diet. The Levin’s index was used to assess the trophic niche width of the species, the feeding strategy was evaluated using Costello’s graphic method and the trophic level was calculated. Finally, to establish whether there were significant differences in the diet by sex, size, or season a PERMANOVA test was used with a 95% confidence level. A total of 202 L. guttatus stomachs were analyzed, 191 of which contained food. A total of 26 prey items were identified. According to the %IRI, the most important prey were the teleost fishes Harengula thrissina (Jordan et Gilbert, 1882) (45.7%) and Sardinops sagax (Jenyns, 1842) (34.8%), the euphausiid Nyctiphanes simplex (13.4%), and the crustacean Penaeus spp. (5.6%). The PERMANOVA analysis resulted in significant differences between the analyzed categories; however, there were no significant differences in the interactions among the categories. According to Levin’s index, L. guttatus had a narrow trophic width, with changes in the main prey consumed by the different categories. According to our results, L. guttatus can be considered a benthopelagic opportunistic carnivorous predator with a narrow trophic niche, presenting mostly quantitative variations in its diet according to sex, size, and season. Its trophic plasticity allows it to take advantage of the most available and abundant food resources.

scholarly journals Atlantic bluefin tuna (Thunnus thynnus) farmed in the Adriatic Sea

2008 ◽  
Vol 52 (No. 4) ◽  
pp. 175-177 ◽  
Author(s):  
E. Srebocan ◽  
J. Pompe-Gotal ◽  
A. Prevendar-Crnic ◽  
E. Ofner
Keyword(s):  
European Commission ◽  
Muscle Tissue ◽  
Liver Tissue ◽  
Total Mercury ◽  
Adriatic Sea ◽  
Maximum Level ◽  
Bluefin Tuna ◽  
Thunnus Thynnus ◽  
Commission Decision ◽  
Wet Weight

Levels of total mercury in the muscle (29 samples) and liver tissue (15 samples) of bluefin tuna (<i>Thunnus thynnus</i>) weighing 100&minus;300 kg were determined by cold vapour atomic absorption (AA) spectroscopy. Tunas were previously captured in the waters of Malta, towed to the farm in the Adriatic Sea and fattened with defrosted herring and sardine for the period of 6 to 7 months. The purpose of the investigation was to determine the magnitude of mercury contamination and to ascertain whether the concentrations in muscle tissue exceeded the maximum level defined by the European Commission Decision (1 &mu;g/g wet weight). Total mercury concentrations in the muscle tissue of tunas ranged from 0.49 to 1.809 (median 0.899 &mu;g/g wet weight) while in the liver tissue it was from 0.324 to 3.248 (median 1.165 &mu;g/g wet weight). Total mercury concentrations in six samples of sardine ranged from 0.050 to 0.072 &mu;g/g wet weight while two samples of herring contained 0.020 and 0.053 &mu;g/g wet weight. Twelve out of 29 (41%) muscle samples of tuna contained mercury above the maximum level defined by the European Commission Decision. It is generally believed that mercury levels in Mediterranean fish are higher than those of the other seas or oceans due to numerous deposits of mercury ores and metallic mercury in surrounding countries.

scholarly journals Cooking process evaluation on mercury content in fish

2010 ◽  
Vol 40 (4) ◽  
pp. 741-748 ◽  
Author(s):  
Luciana Aparecida Farias ◽  
Déborah Inês Fávaro ◽  
José Osman Santos ◽  
Marina Beatriz Vasconsellos ◽  
Artemiza Pessôa ◽  
...  
Keyword(s):  
Process Evaluation ◽  
Fish Species ◽  
Total Mercury ◽  
Feeding Habits ◽  
Mercury Content ◽  
Herbivorous Fish ◽  
Nutritional Evaluation ◽  
Cooking Process ◽  
Roasting Process ◽  
Total Hg

This study evaluated different cooking processes (roasted, cooked and fried) on total mercury (Hg) content in fish species most consumed by Manaus residents and surrounding communities, Amazon region. The results obtained for total Hg in natura and after the three types of preparation (roasted, cooked and fried) for 12 fish species showed a significant Hg concentration variation. In the present study the cooked and frying processes resulted in higher Hg losses for Pacu, Pescada, Jaraqui, Curimatã, Surubin and Aruanã fish species, most of them presenting detritivorous and carnivorous feeding habits. The higher Hg losses in the roasting process occurred for Sardinha, Aracu, Tucunaré, Pirapitinga, Branquinha and Tambaqui fish species, most of them being omnivorous and herbivorous fish species. Some micronutrients (Ca, Fe, K, Na, Se and Zn) in fish species in natura were also determined in order to perform a nutritional evaluation regarding these micronutrients.

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