Fish reproduction is likely to be affected by increasing water temperatures arising from climate change. Normal changes in environmental temperature have the capacity to affect endocrine function and either advance or retard gametogenesis and maturation, but above‐normal temperatures have deleterious effects on reproductive processes. In Atlantic salmon Salmo salar , exposure to elevated temperature during gametogenesis impair...

In order to compare the effects on reproductive performance of short‐term or prolonged exposure to elevated temperatures during vitellogenesis, female Atlantic salmon Salmo salar were held at a water temperature of 22° C for periods of 4 or 6 weeks during the austral summer and autumn. Plasma levels of 17β‐oestradiol (E 2 ), testosterone (T) and vitellogenin (Vtg) were monitored and reproductive success was compared to that in...

Groups of Tasmanian female Atlantic salmon Salmo salar L. were maintained at 14, 18 and 22° C for 3 months from mid‐summer (January). Blood plasma levels of 17β‐oestradiol (E 2 ), testosterone (T), cortisol and vitellogenin (Vtg) were measured at regular intervals, and in autumn (April) temperatures were reduced to 8° C to facilitate spawning and egg incubation. Maintenance at 22° C during vitellogenesis was associated with a...

Nesting male demoiselles Chromis dispilus were captured and blood sampled under water by divers, and plasma levels of reproductive hormones correlated with behavioural status at the time of capture. Plasma gonadotropin‐II (dGtH‐II) was measured using a heterologous assay based on carp GtH‐II standards and an antibody to the β ‐subunit of cGtH‐II. Plasma samples diluted parallel to standards in the assay, and there was a signif...

Striped trumpeter larvae reared in algal cell‐induced turbid water (greenwater) fed equally well in clearwater in a light intensity range of 1–10 μmol s ‐1 m ‐2 , when evaluated in terms of both the proportion of larvae feeding and larval feeding intensity. An ontogenetic improvement in photopic visual sensitivity of larvae was indicated by improved feeding at 0·1 μmol s ‐1 m ‐2 , from 26±5% of larvae feeding and 0·027±0·005 r...