Temperature experienced during vitellogenesis influences ovarian maturation and the timing of ovulation in common wolffish

Abstract

Temperature treatment of common wolffish Anarhichas lupus during vitellogenesis affected the time of final maturation; ovulation in fish held at 8 and 12 C from mid-April to October was about four and five weeks delayed, compared with a 4 C group. Fish in the 8 C group had significantly larger eggs than those in the 4 C and the 12 C groups, and a significantly higher egg production than fish in the 12 C group. Temperature treatment did not affect either fertilization rate or relative fecundity, but absolute fecundity was significantly lower in the 12 C group than the other groups due to poor growth of the fish at high temperature. This did not affect the numbers of spawning individuals. There was a trend towards lower egg survival to the eyed stage in the 12 C group compared to the 4 and 8 C groups, although the effect was not statistically significant. The results indicate that both the timing of final maturation and investment in ovarian growth in common wolffish are affected by temperature experienced during vitellogenesis. 1999 The Fisheries Society of the British Isles

Reproduction of the wedge sole (Dicologoglossa cuneata Moreau) in captivity: spawning parameters and influence of the natural temperature

“…The same was found from 2005 to 2006: DRF decreased but not significantly so, and FE, a typical indicator of egg quality, increased (Kjorsvik et al 1990;Sargent et al 1995). In this sense, Bromley et al (1986) described a significant improvement in turbot egg production after 4 years in captivity, while Tveiten and Johnsen (1999) stated that larger fish The hatching rates found were similar to those reported for Senegal sole and other pleuronectiformes such as turbot and halibut (see Table 4). The significantly lower H in 2006 could be a result of the use of an inadequate egg desinfection protocol with Oxi-AquacultureÒ (a product which contains hydrogen peroxide).…”

Sperm cryoconservation in Anarhichas sp., endangered cold-water aquaculture species with internal fertilization

“…The fish were originally caught by local long-line fishermen. As prescribed by Tveiten and Johnsen (1999), the temperature was maintained at 8-9°C in the months preceding the spawning period and the experimental fish were kept under a natural photoperiod and fed a diet of capelin, mackerel, mussels, and urchins. The experimental fish originated from a group of 20 males held in the presence of several females with previous participation in fertilization operations (confirmed mature status).…”

Evidence that elevated water temperature affects the reproductive physiology of the European bullhead Cottus gobio

“…Several studies on salmonids have shown that exposure to, or maintenance at, higher than normal temperature can change patterns of gonadotropin-releasing hormone (GnRH) activity, secretion, uptake and clearance of gonadotropin (GtH), testicular and ovarian steroidogenesis and metabolism, and plasma levels of reproductive steroids (reviewed by Pankhurst and King 2010;Van Der Kraak and Pankhurst 1997). Generally speaking, these modifying effects may lead to disorders of gametogenesis and gonad development, inhibition of ovulation, advance or delay in the timing of spawning and reduced embryonic survival in various species as for instance in the rainbow trout Oncorhynchus mykiss, the Atlantic salmon Salmo salar and the common wolffish Anarhichas lupus (King et al 2003;Pankhurst et al 1996;Pankhurst and Thomas 1998;Tveiten and Johnsen 1999;Tveiten et al 2001). Recently, Geraudie et al (2010) have reported that elevated temperature during winter time lead to an earlier gonad maturation of roach Rutilus rutilus.…”