Trematomus bernacchii

Benthic fish, Trematomus bernacchii, Antarctic Ocean, 1980-82, whole c/s-Chlordane 4 (2-8) LW 4... 

Figure 7.23. Effects of temperature on mitochondrial function. (Upper panel). Arrhenius plot illustrating the slope discontinuity ( break ) that commonly occurs at a high temperature of measurement, the Arrhenius break temperature (ABT). Data are for mitochondria of the hydrothermal vent tubeworm Riftia pachyptila (after Dahlhoff et al., 1991). (Lower panel) Arrhenius break temperatures for mitochondrial respiration of diverse invertebrates and fishes. The open square is for mitochondrial respiration of the Antarctic nototheniid fish Trematomus bernacchii and is not included in the regression analysis. A line of identify (ABT = adaptation temperature) is also shown (see text for analysis). (Data from Dahlhoff and Somero, 1993b Dahlhoff et ah, 1991 Weinstein and Somero, 1998.)...

Hofmann, G.E., B.A. Buckley, S. Airaksinen, J.E. Keen, and G.N. Somero (2000). Heat-shock protein expression is absent in the Antarctic fish Trematomus bernacchii (Family Nototheniidae). J. Exp. Biol. 203 2331-2339. 

Somero, G.N., A.C. Giese, and D.E. Wohlschlag (1968). Cold adaptation of the Antarctic fish Trematomus bernacchii. Comp. Biochem. Physiol. 26 223-233. 

Chirality has shown that at least some POPs are not likely to be biotransformed by some fish species. Some legacy POPs were racemic in fish, such as the toxaphene congener B7-1453 in cod liver oil [214], as well as cis- and ira 5 -chlordane, a-HCH, o,p -DDT, and photodieldrin in fish oils purchased from various countries [215]. Arctic cod Boreogadus saida) also had racemic amounts of a-HCH, cis- and ira 5-chlordane, U82, MC-5, and MC-7 [190, 216], as well as MC-6 [216] and PCBs [192]. Emerald rockcod (Trematomus bernacchii) in the Antarctic also had racemic residues of a-HCH [195]. 

Two years before, another group produced, in E. coli, two pepsin isoforms from Antarctic rock cod Trematomus bernacchii, pepsins A1 and A2 [34]. Acid endoproteases from cold-adapted organisms could be very interesting to study because of the needs in highly active proteases in cold conditions, required in HX-MS. Nevertheless, both A1 and A2 enzymes present a lower specific activity in cold conditions than commercially available porcine pepsin. Moreover, the specificity of both enzymes is very close to porcine pepsin even if pepsin A1 presents some... 

There have been studies on at least one dozen species of fishes in McMurdo Sound. Those most studied by Antarctic investigators are Trematomus borchgrevinki, T. bernacchii, and Dissostichus mawsoni. The characteristics of the fish are discussed elsewhere (8,12). 

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