14 research outputs found
Length-weight relationships of the ichthyofauna associated with the Brazilian sardine, Sardinella brasiliensis, on the Southeastern Brazilian Bight (22°S-29°S) between 2008 and 2010
A review of the biology and fisheries for longtail, tuna (Thunnus tonggol) in the Indo-Pacific region
Volume 1: Summary report and papers on interaction, is analyzed under the range of ANs 346111-346143. See also AN 455081, v.1, p. 1-60. Please note that link to volume 1 AN 346111 is not possible to remove for technical reasons
Divalent cations enhance ammonia excretion in Lahontan cutthroat trout in highly alkaline water
The effects of extremely alkaline water (pH 9.5) on rainbow trout gill function and morphology
Na+ and K+ body levels and survival of fingerlings of Rhamdia quelen (Siluriformes, Pimelodidae) exposed to acute changes of water pH. NĂveis corporais de Na+ e K+ e sobrevivĂȘncia de alevinos de Rhamdia quelen (Siluriformes, Pimelodidae) submetidos a variaçÔes agudas do pH da ĂĄgua.
The objective of this study was to investigate the effect of water pH on survival and Na+ and K+ body levels of fingerlings of Rhamdia quelen, a freshwater catfish. Survival was 100% at pH 4.00 to 9.0 throughout the experiment (96h), and death of all fingerlings was observed only at pH 3.75 or lower and at pH 10.50. There was a significant correlation between water pH and body Na+ levels (but not K+ levels) 72h after transfer. There was a clear reduction in Na+ levels when the transfer was to pH outside the 5.0 - 9.0 range, which is in agreement with the fact that fishes exposed to such pHâs present loss of ions by diffusion and/or a decrease in absorption. Growth experiments with this species probably would present best results within the 5.0 - 9.0 pH range, in which the decrease of body Na+ levels is reduced.<br>O objetivo deste estudo foi analisar o efeito do pH da ĂĄgua na sobrevivĂȘncia e nĂveis corporais de Na+ e K+ de alevinos de Rhamdia quelen, um peixe de ĂĄgua doce. A sobrevivĂȘncia foi de 100% ao longo do experimento (96h) na faixa de pH de 4,0 a 9,0, e foi observado mortalidade total dos alevinos em pH abaixo de 3,75 (e inclusive) e em pH 10,5. Houve uma correlação significativa entre o pH da ĂĄgua e os nĂveis corporais de Na+ (mas nĂŁo de K+) 72h apĂłs a transferĂȘncia. Quando os alevinos foram transferidos para um pH fora da faixa de 5,0 - 9,0, houve uma nĂtida redução dos nĂveis corporais de Na+, concordando com o fato que peixes expostos a esses nĂveis de pH apresentam perda de Ăons por difusĂŁo e/ou uma redução na sua absorção. O crescimento dessa espĂ©cie, provavelmente, Ă© estimulado dentro da faixa de pH 5,0 - 9,0, na qual a diminuição dos nĂveis corporais de Na+ foi menor