Quantitative changes of black pigmentation in the dorsal fin margin during smoltification in masu salmon, Oncorhynchus masou

Mizuno, Shinya; Misaka, Naoyuki; Ando, Daisei; Kitamura, Takaya

doi:10.1016/s0044-8486(03)00368-5

Cited by 11 publications

(3 citation statements)

References 29 publications

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“…These data suggest that there were no differences in seawater adaptability between K-wild and hatchery fish in our study. Similar results were previously reported in Mizuno et al (2004). Higher gill Na + , K + -ATPase activity in coastal smolts compared to freshwater-adapted K-wild and hatchery mid-smolts suggests more development of seawater adaptability by entry to seawater, which was earlier reported (McCormick et al 1989a).…”

Section: Discussionsupporting

confidence: 90%

Changes in activity and transcript level of liver and gill metabolic enzymes during smoltification in wild and hatchery-reared masu salmon (Oncorhynchus masou)

et al. 2012

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It is important for success of the masu salmon, Oncorhynchus masou, stock enhancement program in Hokkaido (northern Japan) to demonstrate physiological problems in hatchery-reared (hatchery) smolt for artificial release. The present study examined changes in liver and gill metabolic parameters in wild and hatchery masu salmon during smoltification and elucidated differences in hepatic and gill metabolism between wild and hatchery fish. As reference to freshwater-adapted wild and hatchery smolt in this study, metabolic parameters of coastal smolt were studied. Yearling wild and hatchery smolting fish were collected from the Ken-ichi River and the Donan Research Branch, which used Ken-ichi river water for fish culture, at the same time were no remarkable differences in hepatic and gill 3-hydroxyacyl-coenzyme A dehydrogenase related to lipolysis and creatine kinase activities, which operate in resolution of creatine phosphate, during smoltification between hatchery and wild fish.These results suggested hatchery masu salmon had some metabolic problems with carbohydrate metabolism, the citric acid cycle and the respiratory chain. Our study will give valuable information to improve physiological quality of hatchery smolt for artificial release.

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Section: Discussionsupporting

confidence: 90%

Changes in activity and transcript level of liver and gill metabolic enzymes during smoltification in wild and hatchery-reared masu salmon (Oncorhynchus masou)

et al. 2012

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“…A 100 g fish on continuous light was not transferred to seawater, thus it is possible that a winter signal could have had a positive effect on seawater tolerance in a 100 g salmon. In the present study, fish on continuous light developed the morphology of a seawater tolerant Atlantic salmon, with silvery skin and darkening of the fins (Björnsson et al, 2012;McCormick et al, 1998;Mizuno, Misaka, Ando, & Kitamura, 2004). Thus, it seems that Atlantic salmon is capable of developing seawater tolerance as it grows larger, even in the absence of a winter signal.…”

Section: Discussionmentioning

confidence: 66%

Photoperiod in recirculation aquaculture systems and timing of seawater transfer affect seawater growth performance of Atlantic salmon (Salmo salar)

Ytrestøyl

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Kolarevic

et al. 2022

J World Aquaculture Soc

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Production of Atlantic salmon smolts in recirculation aquaculture systems (RAS) is growing, and novel production protocols using continuous light in RAS are being implemented in the industry. In the present study, Atlantic Salmon parr were exposed to either a traditional protocol (short-day winter signal [12:12 L:D] for 6 weeks) or to continuous light. Both photoperiods were applied in freshwater (FW) and brackish water RAS. Salmon from all treatments were transferred to seawater pens at 200 and 600 g and grown until slaughter size. A control group was smoltified with a 6-week short-day winter signal and kept in FW until sea transfer at 100 g. Continuous light gave a higher growth rate in RAS but reduced feed intake and growth and increased feed conversion ratio during the first 8 weeks in seawater. However, at slaughter, fish exposed to continuous light was bigger than fish given a winter signal because of the higher growth rate in RAS. Slaughter weight was lowest in fish transferred to sea at 600 g, despite having the highest day-degree sum during their life span. The best performing group was the control group transferred at 100 g.

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“…11). An absence of decrease of the CF during smoltification sometimes occurs in wild masu salmon (Mayama 1992;Mizuno et al 2004a). This phenomenon can be related to the presence of insects, carried by snowmelt water in spring, in the stomach (Mayama 1992).…”

Section: -4 Development Of Techniques To Improve the Seed Quality Omentioning

confidence: 99%

Studies on Improvement of Seed Production Techniques in Salmonids and Osmerids

Mizuno¹

2012

Aqua-BioSci. Monogr. (ABSM)

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anadromous and stream-resident types. The anadromous type migrates to the ocean in spring after spending 1 or 2 years in the streams. Before the seaward migration, they undergo smoltification, a series of behavioral, morphological, physiological and biochemical changes controlled by multiple hormonal pathways (Hoar 1988) that transform the freshwater parr into a seaward-migratory smolt. After 1 year of life in the ocean, the fish return to their natal stream in spring and spawn in autumn (Kubo 1980;Machidori and Kato 1984;Kato 1991). For the artificial propagation of masu salmon, hatchery-reared (hatchery) juveniles, originating from artificial insemination and fed a commercial food in hatcheries, are released into streams (Mayama 1992). Effects of masu salmon propagation, which are expressed as the recovery rate of released hatchery seed, are of 0.41 to 2.12% (Miyakoshi 2006), while the recovery rate of chum salmon artificial propagation was >10% (Taya 1989). In other Salmon and Freshwater Fisheries Research Institute Fisheries Research Department Local Independent Administrative Agency Hokkaido Research Organization 3-373, Kitakashiwagi, Eniwa, Hokkaido 061-1433, Japan e-mail: mizuno-shinya@hro.or.jp Abstract Anadromous salmonids and osmerids are artificially propagated in Japan by release of their seeds. However, there are many unsolved problems in the techniques of their propagation. In the present monograph, studies on the improvement of seed production techniques in 4 fishes (masu salmon Oncorhynchus masou, chum salmon O. keta, shishamo smelt Spirinchus lanceolatus and Japanese smelt Hypomesus nipponensis) were outlined. Techniques to evaluate dorsal fin pigmentation during smoltification as an external seed quality, and to improve seed quality of hatchery-reared fish, and the discovery of metabolic problems in hatchery-reared fish were described in yearling masu salmon. In underyearling masu salmon, techniques to evaluate nutritional conditions using kidney melano-macrophage density was developed, and applied to the evaluation of the nutritional condition in hatchery-reared fish after release. In chum salmon fry, the development of techniques to monitor the physical condition and to find its appropriate culture conditions was reviewed. In egg cultures of shishamo and Japanese smelt, techniques to eliminate egg adhesiveness with treatments of kaolin or scallop shell powder suspension were established in order to improve hatching rates. In addition, the appropriate embryogenetic stage for the release of shishamo smelt embryos was demonstrated. Consequently, this monograph reveals that these techniques contribute directly to the development of artificial propagation in some salmonids and osmerids. Studies on Improvement of Seed Production Techniques in Salmonids and Osmerids Shinya Mizuno

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Quantitative changes of black pigmentation in the dorsal fin margin during smoltification in masu salmon, Oncorhynchus masou

Cited by 11 publications

References 29 publications

Changes in activity and transcript level of liver and gill metabolic enzymes during smoltification in wild and hatchery-reared masu salmon (Oncorhynchus masou)

Changes in activity and transcript level of liver and gill metabolic enzymes during smoltification in wild and hatchery-reared masu salmon (Oncorhynchus masou)

Photoperiod in recirculation aquaculture systems and timing of seawater transfer affect seawater growth performance of Atlantic salmon (Salmo salar)

Studies on Improvement of Seed Production Techniques in Salmonids and Osmerids

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