The effects of constant photoperiods on the timing of spawning in the rainbow trout

Bromage, Niall; Elliott, J.A.K.; Springate, J.R.C.; Whitehead, C. C.

doi:10.1016/0044-8486(84)90023-1

Cited by 99 publications

(60 citation statements)

References 16 publications

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“…Similar results have been obtained by using other species of Salmonids (13)(14)(15). Obviously the maturity of the fish, dose of the hormone, photoperiod, temperature, pH, and experimental conditions can alter the rate of maturation (14,(16)(17)(18)(19)(20)(21) and can provide samples for study in the laboratory virtually year round (6,13,19).…”

Section: Spermatogenesis; Comparative Histologysupporting

confidence: 68%

87:6582 Advantages of using aquatic animals for biomedical research on reproductive toxicology

1987

Deep Sea Research Part B. Oceanographic Literature Review

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Major advantages of the use of aquatic animals, such as trout, English sole, or sea urchins, for studying the mechanisms of reproductive toxicology are discussed. The remarkable synchrony of differentiation of gametes in large quantities for detailed morphologic and biochemical measurements enables research not readily done on mammalian nonseasonal breeders. Structural differences such as the absence of a fibrous sheath in the more simple structure of fish and sea urchin sperm flagella facilitates comparative study of the mechanism of action of microtubules in flagella movement and the coupling of mitochondrial energy production to microtubules movement.

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Section: Spermatogenesis; Comparative Histologysupporting

confidence: 68%

87:6582 Advantages of using aquatic animals for biomedical research on reproductive toxicology

1987

Deep Sea Research Part B. Oceanographic Literature Review

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“…However, exposure to 24-h light for about a year prior to normal spawning time resulted in early ovulation and a loss of synchronicity in a winter-spawning strain (Bromage et al 1984). We previously reported (Davidson et al 2014) changes in fillet quality traits and reductions in growth and fillet yield coincided with rapid ovarian growth, occurring mainly at or after month 22 posthatch.…”

Section: Discussionmentioning

confidence: 99%

“…Rainbow Trout held under 24-h light conditions for at least part of their reproductive cycle and exposed to static tempera- tures around 13 • C will still produce viable eggs (Bromage et al 1984;Davies and Bromage 2002). However, exposure to 24-h light for about a year prior to normal spawning time resulted in early ovulation and a loss of synchronicity in a winter-spawning strain (Bromage et al 1984).…”

Section: Discussionmentioning

confidence: 99%

Changes in Sex Steroids, Growth Hormone, and Insulin‐Like Growth Factor‐I during Ovarian Development in Rainbow Trout Cultured in a Water Recirculating System with Continuous Light

et al. 2015

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Female Rainbow Trout Oncorhynchus mykiss were cultured within a freshwater recirculating aquaculture system under 24‐h constant lighting in 13°C water and fed every 6 h to near satiation. An opaque roof allowed surface light intensity to vary between <200 and about 1,500 lx. During months 14–26 posthatch we examined changes in plasma concentrations of testosterone (T), estradiol‐17β (E2), the maturation inducing steroid (MIS) 17α,20β‐dihydroxy‐4‐pregnen‐3‐one (17,20βP), growth hormone (GH), and insulin‐like growth factor‐I (IGF‐I). Oocyte diameter was variable at the start of the study, most averaging <1 mm; diameter increased to above 3.2 mm in the final 2 months, with migrating germinal vesicles indicating they were postvitellogenic. Some ovaries exhibited atresia, and no fish ovulated, suggesting some reproductive dysfunction. Testosterone and E2 began increasing between months 16 and 18, and although T continued to increase throughout the study, E2 changed little after month 20. The MIS 17,20βP, remained near or below detection. Plasma GH remained relatively unchanged although values trended slightly higher during the final 4 months, GH being significantly greater at months 22, 24 and 26 than at month 16. Plasma IGF‐I was higher at the first time point, month 14 posthatch than at months 20, 24, 25, and 26. In summary, gradual changes in growth and fillet quality attributes during gonadal development were accompanied by gradual changes in hormone levels, but no clear changes in hormones were associated with rapid changes in product quality traits observed around months 24–26.

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“…Photoperiod and feed manipulation are used in the salmon farming industry to influence growth (Storebakken and Austreng, 1987a;Handeland and Stefansson, 2001), maturation (Bromage et al, 1984;Rowe et al;1991) and smoltification (Skilbrei, 1991;Duston and Saunders, 1992). During freshwater production of Atlantic salmon, high growth rates allow individuals to achieve the size threshold for smoltification within short periods of time (Elson, 1957;Kristinsson et al, 1985;Skilbrei, 1988) and these growth rates can be achieved by manipulating both dietary and photoperiod regimes (Solbakken et al, 1994;Thrush et al, 1994;Helland and Grisdale-Helland, 1998;Handeland and Stefansson, 2001).…”

Section: Introductionmentioning

confidence: 99%

The effects of daily ration on growth and smoltification in 0+ and 1+ Atlantic salmon (Salmo salar) parr

Berrill¹,

Porter²,

Bromage³

2006

Aquaculture

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The effects of long-term variations in feed ration were studied during two experiments on Atlantic salmon parr. In the first experiment, three duplicate groups of approximately 500 salmon parr were fed at rates of 100%, 66% or 33% of the manufacturer's recommendation from shortly after first feeding. Each group were exposed to a photoperiod regime which was expected to result in smoltification 9 months after first feeding. In the second experiment, three duplicate groups of 550 fish were fed 100%, 66% or 33% of the manufacturer's recommendation from first feeding and exposed to a simulated natural photoperiod, which was expected to result in smoltification 13 months after first feeding.In both experiments fish size increased with ration, with recruitment to the upper modal group (UMG) of the population also related to ration (85-96%, 64-88% and 28-42% UMG fish for the full, two-thirds and one-third ration groups respectively, recorded at the conclusion of each experiment). Throughout each experiment the full and two-thirds ration fish maintained similar whole body lipid concentrations, although lipid concentrations in the one-third ration fish were generally lower. At the conclusion of experiment 1, gill Na + , K + -ATPase activity in UMG fish fed full rations reached 9.5 µmol ADP hydrolysed. mg -1 . protein -1 . h -1 , whereas ATPase activities were lower in the other ration groups. In experiment 2, all groups had similar gill Na + , K + ,-ATPase activities at the conclusion of the experiment (6.4-9.3 µmol ADP hydrolysed. mg -1 . protein -1 . h -1 ). Following 24h seawater challenges, conducted during the parr-smolt transformation, UMG fish from the full and two-thirds groups of experiment 1 displayed high survival rates (100%) and low serum osmolalities (335 mOsm.kg -1 ), with lower survival rates (75%) and higher serum osmolalities (370 3 mOsm.kg -1 ) recorded in the one-third ration fish. In experiment 2 similar survival rates (100%) and serum osmolalities (350 mOsm.kg -1 ) were found in all ration groups.It is concluded that under accelerated production regimes, feed restriction may result in underyearling Atlantic salmon smolts developing a poor hypo-osmoregulatory ability. Variations in ration significantly influence growth, although it is believed that growth is dependant on the maintenance of a specific lipid level in the body.

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The effects of constant photoperiods on the timing of spawning in the rainbow trout

Cited by 99 publications

References 16 publications

87:6582 Advantages of using aquatic animals for biomedical research on reproductive toxicology

87:6582 Advantages of using aquatic animals for biomedical research on reproductive toxicology

Changes in Sex Steroids, Growth Hormone, and Insulin‐Like Growth Factor‐I during Ovarian Development in Rainbow Trout Cultured in a Water Recirculating System with Continuous Light

The effects of daily ration on growth and smoltification in 0+ and 1+ Atlantic salmon (Salmo salar) parr

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