What Controls the Onset of Anorexia in Maturing Adult Female Atlantic Salmon?

Kadri, Sunil; Metcalfe, Neil B.; Huntingford, Felicity A.; Thorpe, J. E.

doi:10.2307/2390254

Cited by 84 publications

(61 citation statements)

References 23 publications

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“…Notwithstanding the possibly intense selective pressure in favour of early maturity in response to high marine mortality (Hutchings & Jones 1998 ), that such energetically impoverished individuals should continue to mature and return as 1SW fi sh can be reconciled with the above energetic model only if catabolism of reserves had occurred in the few weeks prior to summer return to coastal waters, and following Thorpe ' s critical spring photoperiod ' window ' . But this seems unlikely, given that Kadri et al (1995) recorded a daily weight loss rate of only 0.1% per day for 1SW cultured salmon held in tanks during the summer weeks following their cessation of feeding. The available evidence for these time series of wild 1SW adults points to an extended period of months of food limitation or starvation perhaps dating to midwinter, and almost certainly prior to a spring photoperiod maturation window.…”

Section: Maturity S Chedulesmentioning

confidence: 99%

Getting into Hot Water? Atlantic Salmon Responses to Climate Change in Freshwater and Marine Environments

Todd

Friedland

MacLean

et al. 2010

Atlantic Salmon Ecology

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Recent and projected climate changes -both in the freshwater and marine environments exploited by Atlantic salmon -present considerable adaptive challenges to many populations. In assessing the predictions and possible impacts of overall climate change, we focus in fresh water on precipitation, river discharge and temperature, whilst for the marine environment we highlight the interactions between temperature, size/growth -mediated predation and shifts in prey assemblages. Changes in seasonal temperature and fl ow regime will probably exert complex or confl icting interactions for particular river stocks in terms of freshwater survivorship, growth, smoltifi cation and timing of emigration. Ocean temperature changes will directly affect early post -smolt survivorship and indirectly infl uence prey availability and hence longer -term survivorship, growth, maturation and spawning run -timing. It is of immediate concern that most salmon stock abundances presently are at historical lows, but perhaps the greatest uncertainty in projecting their future health lies in our poor understanding of the genetic and ecological adaptability of populations in relation to the likely rate(s) of environmental change. Against the backdrop of a rapidly changing environment, a precautionary approach to managing salmon populations should be holistic and integrative of both the marine and freshwater environments, and should include the maintenance of their genetic variability and integrity.

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Section: Maturity S Chedulesmentioning

confidence: 99%

Getting into Hot Water? Atlantic Salmon Responses to Climate Change in Freshwater and Marine Environments

Todd

Friedland

MacLean

et al. 2010

Atlantic Salmon Ecology

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“…In fish, non-polar lipid density is typically used as a measure of an individual's energetic state because it is the main energy source utilized during periods of starvation, reproduction, and maturation (Wootton et al 1978, Reznick & Braun 1987, Norton et al 2001. Several studies have confirmed a relationship between K or K n and non-polar lipid density, including in three-spined stickleback Gasterosteus aculeatus (Chellappa et al 1995), striped bass Morone saxatilis (Gershanovich et al 1984, Brown & Murphy 1991, broad whitefish Coregonus nasus (Fechhelm et al 1995), ship sturgeon Acipenser nudiventris (Gershanovich et al 1984), muskellunge Esox masquinongy (Jonas et al 1996), and Atlantic salmon Salmo salar (Pinder & Eales 1969, Herbinger & Friars 1991, Kadri et al 1995. However, Simpson et al (1992) and Sutton et al (2000) showed that in Atlantic salmon, the strength of the correlation between the condition factors and lipid density varied during the season, stressing the importance of determining an association at critical periods, such as at the onset of breeding for studies of mating systems and reproductive success.…”

Section: Introductionmentioning

confidence: 99%

Relationships between condition factors, parasite load and paternity in bluegill sunfish, Lepomis macrochirus

Neff

Cargnelli

2004

Environmental Biology of Fishes

101

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SynopsisWe examined the relationship between non-polar lipid density, parasite density and paternity of male bluegill sunfish, Lepomis macrochirus, and four condition factors: (1) Fulton's condition factor, K; (2) the relative condition factor, K n ; (3) the relative mass index, W r ; and (4) the residuals from the geometric regression of mass on total length, C. Although the four factors were highly correlated to each other, only K and W r were significantly correlated with non-polar lipid density, explaining about 40% and 25% of the variation, respectively. K was also the best predictor of parasite density and was significantly correlated with the paternity of nesting males. These data provide support for K as a good indicator of individual energetic state and overall quality during the breeding period and demonstrate the importance of energetic state for understanding reproductive success in bluegill sunfish.

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“…A high proportion (75%) of the larger (>80 mm long) smelt were not feeding and we noted that 67% of these fish contained either ripe eggs or milt. The feeding rates of mature fish (i.e., with well developed gonads) are often lower than those of immature fish (Metcalfe et al 1986;Rowe & Thorpe 1990;Kadri et al 1995). The maturation of some smelt may therefore have reduced their feeding rates and this could explain the lack of feeding in some of the larger smelt.…”

Section: Discussionmentioning

confidence: 99%

Effects of turbidity on the feeding ability of adult, riverine smelt (Retropinna retropinna)and inanga (Galaxias maculatus)

Rowe¹,

Smith

Williams

2002

New Zealand Journal of Marine and Freshwater Research

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Laboratory tank experiments indicated that turbidity levels up to 160 Nephelometric Turbidity Units (NTU) did not reduce the feeding rates of adult smelt (Retropinna retropinna Richardson), or inanga (Galaxias maculatus Jenyns), on Daphnia sp. Mean feeding rates were higher for inanga than for smelt. However, the lower rates for smelt were related to the greater variation in individual feeding rates. Specifically, a few fish fed intensively while most did not. As the feeding ability of both species was unaffected by turbidity levels up to 160 NTU, they were less sensitive to turbidity than juvenile banded kokopu (Galaxias fasciatus Gray). Juvenile banded kokopu should therefore be used as the benchmark species for setting turbidity guidelines to protect native fish in rivers where this species is present. Both juvenile and adult rainbow trout (Oncorhynchus mykiss Richardson) appear to be more sensitive to turbidity than adult inanga and smelt, so should be used as benchmark species in all other waters.

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What Controls the Onset of Anorexia in Maturing Adult Female Atlantic Salmon?

Cited by 84 publications

References 23 publications

Getting into Hot Water? Atlantic Salmon Responses to Climate Change in Freshwater and Marine Environments

Getting into Hot Water? Atlantic Salmon Responses to Climate Change in Freshwater and Marine Environments

Relationships between condition factors, parasite load and paternity in bluegill sunfish, Lepomis macrochirus

Effects of turbidity on the feeding ability of adult, riverine smelt (Retropinna retropinna)and inanga (Galaxias maculatus)

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