Variações na demanda de energia metabólica de juvenis deHaemulon steindachneri (Perciformes, Haemulidae) em função da temperatura

Rocha, Arthur José da Silva; Gomes, Vicente; Ngan, Phan Van; Passos, Maria José de Arruda Campos Rocha

doi:10.1590/s1413-77392001000100008

Cited by 4 publications

(5 citation statements)

References 36 publications

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“…Distinct mechanisms can be employed to maintain the internal homeostasis and the adequate level of energy expenditure, varying from behavioral changes to shifts of distinct metabolic pathways (ECHEVARRÉA et al, 1993;ROCHA et al, 2001 CONOVER, 1988). Our data suggest a metabolism depending mainly on proteins shifting to a dependence on a mixture of proteins and lipids.…”

Section: Discussionmentioning

confidence: 77%

“…Salinity, however, although generally stable, can be modified temporarily in coastal regions by melting ice (SZAFRANSKI;LIPSKI, 1982). When temperature is studied in conjunction with salinity variations, the importance of temperature changes can be even better understood and reveal important shifts in energy demand (ROCHA et al, 2001;ALLAN et al, 2006;FILIPPOV, 2006). In addition, laboratory investigations can also improve our comprehension of the homeostatic abilities to modulate processes according to the degree of temperature and salinity variations.…”

Section: Introductionmentioning

confidence: 99%

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Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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A B S T R A C TChanges in environmental factors may deeply affect the energy budget of Antarctic organisms as many of them are stenothermal and/or stenohaline ectotherms. In this context, the aim of this study is to contribute to knowledge on variations in the energy demand of the Antarctic amphipod, Gondogeneia antarctica as a function of temperature and salinity. Experiments were held at the Brazilian Antarctic Station "Comandante Ferraz", under controlled conditions. Animals collected at Admiralty Bay were acclimated to temperatures of 0°C; 2.5°C and 5°C and to salinities of 35, 30 and 25. Thirty measurements were made for each of the nine combinations of the three temperatures and three salinities, totalling 270 measurements. Metabolic rates were assessed by oxygen consumption and total nitrogenous ammonia excretion, in sealed respirometers. When acclimated to salinities 30 or 35, metabolic rates at 0°C and 2.5°C were very similar indicating a possible mechanism of metabolic compensation for temperature. At 5.0°C, however, metabolic rates were always higher. Lower salinities enhanced the effects of temperature on metabolism and ammonia excretion rates. The physiological adaptations of individuals of G. antarctica suggest adaptive mechanisms for energy saving, adjusted to an environment with stable conditions of temperature and salinity. Little is known about the joint effects of salinity and temperature and this study is an important contribution to the understanding of the mechanism of polar organisms in their adaptation to both factors. R E S U M OAlterações ambientais podem modificar a alocação de energia dos organismos, principalmente dos ectotermos estenotérmicos e/ou estenohalinos. Nesse contexto, este trabalho contribui com o conhecimento da demanda de energia do anfípode antártico Gondogeneia antarctica em função da temperatura e da salinidade. Experimentos foram realizados na Estação Antártica Brasileira "Comandante Ferraz", em condições laboratoriais controladas. Animais coletados na Baía do Almirantado foram aclimatados a temperaturas de 0°C; 2.5°C e 5°C e salinidades de 35, 30 and 25. Foram realizadas trinta medições para cada uma das nove combinações das três temperaturas com as três salinidades, totalizando 270 medições. As taxas metabólicas foram estimadas por meio do consumo de oxigênio e excreção de amônia, em câmaras respirométricas seladas. Quando aclimatados a salinidades 30 ou 35, as taxas metabólicas a 0°C e 2.5°C foram semelhantes indicando possível mecanismo de compensação térmica, nessa faixa de variação dos fatores. A 5.0°C, no entanto, as taxas metabólicas foram sempre mais elevadas. Baixas salinidades potencializaram os efeitos da temperatura no consumo de oxigênio e na excreção de produtos nitrogenados. Os resultados estão relacionados a mecanismos adaptativos para economia de energia em indivíduos G. antarctica, ajustados a um ambiente que tem condições estáveis de temperatura e de salinidade. Pouco se sabe sobre os efeitos conjugados da salinidade e temperatura nos organismos e...

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Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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“…Higher ammonia excretion has also been reported in L. vannamei fed high protein or carnivorous diet (50% protein) than in shrimp fed high carbohydrate or herbivorous diet (Maldonado et al, 2009;Rosas et al, 2001). In fasted shrimp, ammonia excretion did not differ from shrimp fed the Mix diet, suggesting that during the fasting period shrimp metabolized endogenous reserves to provide energy for vital functions (Comoglio et al, 2004;Rocha et al, 2001;Sánchez-Paz et al, 2007). Energy expenditure in U for L. vannamei has been reported as 3-6% of the total energy intake (Yan et al, 2007;Zhu et al, 2004).…”

Section: Discussionmentioning

confidence: 86%

“…Dissolved oxygen concentration and total ammonia nitrogen (TAN) were determined in both initial and final water samples to calculate consumption/ excretion by difference. Oxygen levels in chambers were never under 70% saturation after incubation to avoid hypoxic stress and the tests were always performed in the same time zone of the day, in order to minimize the influence of exogenous factors that could affect shrimp metabolism (Rocha et al, 2001). Dissolved oxygen consumption (ml O 2 g -1 shrimp live weight h -1 ) was determined by application of the Winkler method (Grasshoff et al, 1983) and total ammonia nitrogen excretion (µmol TAN g -1 shrimp live weight h -1 ) by the colorimetric method (Koroleff, 1970) with adaptation to 10 mm path length cuvettes read.…”

Section: Energy Budgetmentioning

confidence: 99%

Energy budgets for juvenile Pacific whiteleg shrimp Litopenaeus vannamei fed different diets

et al. 2019

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Coelho et al.: Energy budget in juvenile whiteleg shrimp 1 Energy budgets for juvenile Pacific whiteleg shrimp Litopenaeus vannamei fed different diets Energy budgets for juvenile Pacific whiteleg shrimp, Litopenaeus vannamei (1.7-4.0 g) fed with different diets were assessed. The energy partitioning between growth, respiration, ammonia excretion, feces and exuvia was calculated to estimate for total food energy intake. Shrimp oxygen consumption and ammonia excretion were quantified in sealed chambers (25°C, 34 ppt). Energy allocated for growth and feces were obtained from the wet combustion of whole body and feces samples, exuvia was estimated as 10% growth energy. Three diets were tested: 100% chopped fish (Fish), 100% commercial feed (Feed), and 50-50% chopped fish and commercial feed (Mix). Most of the energy from the diets was channeled into respiration (49.7-70.5%). Shrimp fed the Feed diet used more energy in growth (24.4%) than those fed Mix (13.4%) or Fish diets (13.2%), either in absolute (joule) or relative (% of ingested energy) terms. Conversely, energy loss as ammonia excretion was lower in shrimp fed Feed (1.0%) compared to shrimp fed Mix (4.2%) or Fish diets (7.8%). Less energy was lost in feces by shrimp fed Fish diet (7.3%) compared to Mix (20.2%) and Feed diets (22.2%). The calculated energy intake by shrimp fed Fish, Mix and Feed were 0.995, 1.100, and 1.255 kJ ind-1 day-1 , respectively. According to the O:N atomic ratios (oxygen consumed to nitrogen excreted), protein tented to be the predominant substrate catabolized by shrimp fed Fish (O:N=16±5.2), and Mix (O:N=25±11.6), with increasing use of carbohydrates and/or lipids in the Feed (O:N=74±37.3). Results suggest diet composition may affect energy budget and partitioning differently between metabolism and growth either in absolute or relative terms, as shrimp fed Fish and Mix diets used protein as main substrate for metabolism, whereas shrimp fed Feed diet channeled protein for growth, and lipids and carbohydrates for other metabolic functions.

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“…Species from this gender are encountered mainly in shallow waters and rocky coasts. They also play a key ecological role, essential to the integrity of the marine ecosystem (Rocha et al, 2003). Preliminary faunal surveys in the areas where mariculture is to be implemented would serve as a tool to a more judicious assessment of the degenerative or regenerative potentiality that maricultural activities can entail.…”

Section: Control Areamentioning

confidence: 99%

Mariculture Impacts on the Benthonic Icthyofauna of Itaguá Bay, Ubatuba, Southeast Brazil

et al. 2019

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Due to the decline of fishing stocks, aquaculture has been expanding throughout the world. Taking into account the possibility of conflicts of aquacultural activities in areas of environmental protection, this study aims at assessing the effects of mariculture upon the local ichthyofauna of Itaguá Bay in Ubatuba, São Paulo state, Brazil, which is within a marine protection area. In order to do so, the fish community was analyzed in areas with mussels and macroalgae farms and in areas without any maricultural activities. After six months of sampling efforts, 230 individuals were captured from 19 different species and 15 families. There was no difference in catchability, richness, diversity, and evenness among the areas. Nevertheless, the species composition was distinct in areas where mussels were farmed. These areas have presented twice as much fish biomass than the others. Based on these results, we can observe that the environmental alterations caused by mussel farming, are sources of habitat complexity, hence able to enrich the marine fauna of the region. Thus, we conclude that mariculture, specifically mussel farming, has a positive impact on ichthyofauna, contributing to biodiversity maintenance in protected areas.

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Variações na demanda de energia metabólica de juvenis deHaemulon steindachneri (Perciformes, Haemulidae) em função da temperatura

Cited by 4 publications

References 36 publications

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

Energy budgets for juvenile Pacific whiteleg shrimp Litopenaeus vannamei fed different diets

Mariculture Impacts on the Benthonic Icthyofauna of Itaguá Bay, Ubatuba, Southeast Brazil

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