REVIEW Cultivation of Arctic charr: an update     

Malcolm Jobling  Helge Tveiten  Bjarne Hatlen 《Aquaculture International》1998,6(3):181-196

There has been interest in farming Arctic charr, Salvelinus alpinus, since the 1970s, but expansion of the industry has not been as rapid as originally predicted due to problems experienced with obtaining supplies of viable eggs and juveniles, variable growth and flesh pigmentation during grow-out, problems with year-round culture in sea water, early maturation, and problems related to the marketing of portion-size fish. Several of these problems are probably a manifestation of a mismatch between the environmental requirements of the fish and the rearing environment. For example, variable rates of broodstock maturation and poor survival of eggs are probably the result of holding broodstock charr at temperatures that are unsuitable for optimal reproduction. Poor and heterogeneous rates of growth during grow-out may be the result of rearing the fish at sub-optimal stocking densities. Further, variable fillet pigmentation may be a manifestation of variable growth rates, rather than being a true reflection of the ability of charr to deposit carotenoids in their flesh. Provided that the fish are held under conditions that promote good rates of growth, charr appear to be able to deposit adequate amounts of pigment in their flesh when fed diets that contain 50–70 mg pigment per kg diet. © Rapid Science Ltd. 1998  相似文献   

Lack of evidence of vertical transmission of piscine myocarditis virus in Atlantic salmon (Salmo salar L.)     

Aase B. Mikalsen  Morten Lund  Farah Manji  Mari Viken Kjønstad  Per Helge Bergtun  Gordon Ritchie  Vidar Aspehaug  Magnus Devold  Øystein Evensen 《Journal of fish diseases》2020,43(6):715-718

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Effects of early weaning strategies on growth,survival and digestive enzyme activities in cobia (<Emphasis Type="Italic">Rachycentron canadum</Emphasis> L.) larvae     

Huy Quang Nguyen  Helge Reinertsen  Per-Arvid Wold  Thien Mai Tran  Elin Kjørsvik 《Aquaculture International》2011,19(1):63-78

The effects of weaning strategies of cobia (Rachycentron canadum L.) larvae to commercial microdiets, either from rotifers or from Artemia, on growth, survival and enzymatic digestive capacity, were investigated. In the first experiment, cobia larvae were weaned from rotifers by co-feeding with a microdiet (Otohime) from 8, 13 or 20 days post-hatching (dph). The larvae in the control treatment were fed rotifers (2–12 dph), Artemia nauplii from 7 dph, and co-fed with the microdiet from 20 dph. In the second experiment, the larvae were weaned from Artemia, which was fed to the larvae from 7 dph, by co-feeding with a microdiet (NRD) from 8, 13 or 18 dph. The larvae in control treatment were fed rotifers, then Artemia to the end of the experiment (28 dph). Weaning of cobia larvae onto a microdiet directly from rotifers significantly reduced growth, survival and digestive capacity of the larvae and did not lead to larval acceptance of the microdiet, compared to those weaned from Artemia in the first experiment. Early weaning of cobia larvae onto NRD microdiet (on 8 or 13 dph) from Artemia in the second experiment also reduced growth, survival rate and gut maturation index, compared to those fed live feed. With available microdiets, weaning of cobia larvae could start from Artemia at around 18 dph in order to obtain comparable growth, survival and gut maturation to larvae fed live feed.  相似文献