An experimental study of the oxygen consumption, growth, and metabolism of the COD (Gadus Morhua L.)

Effects of food consumption and temperature on growth rate and biochemical-based indicators of growth in early juvenile Atlantic cod Gadus morhua and haddock Melanogrammus aeglefinus

“…For example, rates of C max in cod larvae, 0.90 g juveniles, 7.30 g juveniles, and 500 g adults have been measured to be ~55, 13.1, 8.9, and 1.9% d , respectively (Edwards et al 1972, see their Table 2; Karamushko & Reshetnikov 1994, present study). The allometric scaling of G max with body size has been quantified at a variety of temperatures by Björnsson & Steinarsson (2002) for juvenile and adult cod and by Otterlei (2000) for young juveniles over a size range of 2 to 20 g. In the present study, our value of G max for cod S (0.92 g) at 8°C was 2.1% d -1…”

“…For example, GGE was greatly affected by ration level, with GGE max occurring at intermediate levels of food consumption at each temperature for cod (except cod S at 12°C) due to the non-linear (asymptotic) growth-feeding relationship observed in this study. GGE max was also observed at intermediate ration levels for larger (500 g wet weight) Atlantic cod by Edwards et al (1972), and in any species where the growth-feeding relationship is observed to be asymptotic (e.g. Elliott 1975b, Brett & Groves 1979.…”

“…The literature is equivocal with respect to the shape of the growth-feeding relationship in marine fish with both non-linear (asymptotic) (Elliott 1975b, Brett & Groves 1979 and linear (Staples & Nomura 1976, Malloy & Targett 1994 relationships observed in other species. Similarly, studies on cod have indicated both non-linear (asymptotic) (Edwards et al 1972, Brown et al 1989) and linear (Jones & Hislop 1978, Hawkins et al 1985 Table 4. Gadus morhua and Melanogrammus aeglefinus.…”

“…Edwards et al 1972, Jones 1978, Jones & Hislop 1978, Hawkins et al 1985, relatively little research has been conducted on this relationship in age-0 juvenile cod. Our understanding of the growth-feeding relationship in age-0 juvenile cod has been advanced by studies conducted at cold temperatures (Brown et al 1989) and maximal feeding levels (Otterlei 2000, Purchase & Brown 2000.…”

Spontaneous activity was unaffected by ration size in Nile tilapia and gibel carp

“…Kerr (1982) proposed a linear relationship between activity metabolism and ration size in actively predatory fishes. However, the relationship was derived indirectly from the growth efficiency data in cod Gadus morhua L. (Edwards et al, 1972). By using bioenergetics models to fit the field estimates of growth and food consumption data for Perca flavescens Mitchill, Boisclair & Leggett (1989) also suggested …”