Ocorrência e distribuição de Chromobacterium violaceum (Schroeter) Bergonzini 1881, na Amazônia Central

Guarim, Vera Lucia M. dos Santos

doi:10.1590/1809-43921979093501

Cited by 2 publications

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“…their type of water (Guarim, 1979;Santos and Ribeiro, 1988;Cravo et al, 2002;Barthem and Goulding, 2007;Lages, 2010;Horbe et al, 2013;Silva, 2013).…”

Section: /9mentioning

confidence: 99%

SPATIAL AND SEASONAL VARIATION OF PEACOCK BASS (<i>Cichla</i> spp.) FISHERY: AN ANALYSIS OF CATCHES LANDED IN MANAUS, AMAZONAS STATE, BRAZIL

Dias¹,

Souza²,

Freitas³

2020

Bol. Inst. Pesca

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This study analysed the commercial fishing for peacock bass (Cichla spp.) and its variation according to the river regime and the fishing environments, based on landing data in Manaus. The landing data were provided by the Z-12 Fishermen's Association and the monthly quotas (m) of Rio Negro by the National Water Agency, corresponding to the years 2012 and 2013. The Catch per Unit of Effort (CPUE) was obtained by dividing the total catch and the number of boats. A Generalized Linear Model was used to analyse the relationship between CPUE and the river level. Through the Analysis of Variance we compared the averages of capture between the fishing areas and Fisher's LSD test revealed which environments had different capture averages. Student's t-test was used to compare the mean of capture between white and black water environments. The largest catches and CPUEs occurred during receding water, and the relationship between CPUE and river level was inverse. Black water environments obtained the highest CPUEs, as well as the highest capture averages. There were differences in the average catches between fishing areas, but not between water types. This study shows how peacock bass exploitation occurs and can assist in management measures for this species.

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“…their type of water (Guarim, 1979;Santos and Ribeiro, 1988;Cravo et al, 2002;Barthem and Goulding, 2007;Lages, 2010;Horbe et al, 2013;Silva, 2013).…”

Section: /9mentioning

confidence: 99%

SPATIAL AND SEASONAL VARIATION OF PEACOCK BASS (<i>Cichla</i> spp.) FISHERY: AN ANALYSIS OF CATCHES LANDED IN MANAUS, AMAZONAS STATE, BRAZIL

Dias¹,

Souza²,

Freitas³

2020

Bol. Inst. Pesca

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Physiological protective action of dissolved organic carbon on ion regulation and nitrogenous waste excretion of zebrafish (Danio rerio) exposed to low pH in ion-poor water

et al. 2018

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Dissolved organic carbon (DOC) represents a heterogeneous group of naturally-occurring molecules in aquatic environments, and recent studies have evidenced that optically dark DOCs can exert some positive effects on ionoregulatory homeostasis of aquatic organisms in acidic waters. We investigated the effects of Luther Marsh DOC, a dark allochthonous DOC, on ion regulation and N-waste excretion of zebrafish acutely exposed to either neutral or low pH in ion-poor water. In the first experiment, simultaneous exposure to pH 4.0 and DOC greatly attenuated the stimulation of Na diffusive losses (J ), and prevented the blockade of Na uptake (J ) seen in zebrafish exposed to pH 4.0 alone, resulting in much smaller disturbances in Na net losses (J ). DOC also attenuated the stimulation of net Cl losses (J ) and ammonia excretion (J ) during acidic challenge. In the second experiment, zebrafish acclimated to DOC displayed similar regulation of J and J , and, therefore, reduced J at pH 4.0, effects which persisted even when DOC was no longer present. Protective effects of prior acclimation to DOC on J and J at pH 4.0 also occurred, but were less marked than those on Na balance. Urea fluxes were unaffected by the experimental treatments. Overall, these effects were clearly beneficial to the ionoregulatory homeostasis of zebrafish at low pH, and were quite similar to those seen in a recent parallel study using darker DOC from the upper Rio Negro. This suggests that dark allochthonous DOCs share some chemical properties that render fish tolerant to ionoregulatory disturbances during acidic challenge.

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Ocorrência e distribuição de Chromobacterium violaceum (Schroeter) Bergonzini 1881, na Amazônia Central

Cited by 2 publications

References 0 publications

SPATIAL AND SEASONAL VARIATION OF PEACOCK BASS (<i>Cichla</i> spp.) FISHERY: AN ANALYSIS OF CATCHES LANDED IN MANAUS, AMAZONAS STATE, BRAZIL

SPATIAL AND SEASONAL VARIATION OF PEACOCK BASS (<i>Cichla</i> spp.) FISHERY: AN ANALYSIS OF CATCHES LANDED IN MANAUS, AMAZONAS STATE, BRAZIL

Physiological protective action of dissolved organic carbon on ion regulation and nitrogenous waste excretion of zebrafish (Danio rerio) exposed to low pH in ion-poor water

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