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1
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First record of brown colouration of Atlantic cod (Gadus morhua, L.) from the North Sea

100%
Rybczyk A., Czerniejewski P., Rokicka-Praxmajer J.
Oceanologia
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2014
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tom 56
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nr 1
2

Fecundity of cod [Gadus morhua callarias L.] in the Southern Baltic in the late 1990s

100%
Kosior M., Trella K., Jaworski A.
Acta Ichthyologica et Piscatoria
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2001
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tom 31
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nr 2
The fecundity of cod from the southern Baltic Sea in the late 1990s was estimated from 461 pairs of ovaries at the maturity stage IV (according to Maier′s scale). Number of eggs per female was estimated for different length, weight, and age classes of fish obtained from the ICES subdivisions: 25 (Bornholm Deep) and 26 (Gdańsk Deep). Absolute fecundity in relation to body length and age, as well as relative fecundity, showed no differences between the two subdivisions, whereas absolute fecundity in relation to body weight was slightly higher in females from the Gdańsk Deep. Absolute fecundity in relation to age showed a high variability, particularly among age classes 5 and older. Absolute fecundity of cod in the southern Baltic has increased slightly over the past four decades. Length at first maturity, i.e. length at which 50 % of females are mature, was estimated to be 40.2 cm for females from the Gdańsk Deep.
3
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Is it possible to use parasites as bioindicators of the coastal cod in the Barents Sea?

100%
Karasev A. B.
Wiadomości Parazytologiczne
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1998
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tom 44
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nr 3
4

Differences between the Baltic cod Gadus morhua callarias L. and Atlantic cod Gadus morhua morhua L., by skeletal muscle protein polymorphism, analyzed with classical SDS-PAGE electrophoresis

84%
Antoszek A., Antoszek J., Wiecaszek B., Drozd R., Suszycki S.
Electronic Journal of Polish Agricultural Universities. Series Fisheries
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2011
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tom 14
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nr 3
5

Gonadal differentiation in Atlantic cod, Gadus morhua L., and haddock, Melanogrammus aeglefinus [L.]

84%
Chiasson M., Benfey T. J., Martin-Robichaud D. J.
Acta Ichthyologica et Piscatoria
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2008
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tom 38
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nr 2
127-133
Background. The purpose of this study was to determine the timing of gonadal differentiation in two gadoids: Atlantic cod, Gadus morhua L., and haddock, Melanogrammus aeglefinus (L.). This information is required to develop a practical protocol for the production of monosex populations of these species for aquaculture. Materials and Methods. Cultured larvae and juveniles were collected weekly, measured (total length; TL), prepared histologically and then examined microscopically for the presence of characteristic stages of gonadal differentiation. Results. In Atlantic cod, undifferentiated gonads were present by 18 mm TL, at 84 days post hatch (dph), and definitive germ cells by 19 mm TL (90 dph). Ovarian cavities were first observed at 27 mm TL (102 dph), and by 35 mm TL (112 dph) anatomical divergence into two types of gonads was clear. In haddock, undifferentiated gonads were observed at 21 mm TL (64 dph) and an ovarian cavity was evident at 29 mm TL (71 dph). Conclusion. Gonadal differentiation in Atlantic cod and haddock occurs at roughly the same size in both species (27 and 29 mm TL, respectively). For successful sex reversal, the administration of steroids should therefore begin at approximately 25 mm TL, shortly after weaning onto dry feed.
6

Persistent organic pollutant content in cod [Gadus morhua L.] from the Barents Sea Region

84%
Sapota G., Wisniewska-Wojtasik B.
Oceanological and Hydrobiological Studies
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2007
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tom 36
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nr 3
7

Comparative study of biometric characters of the 'golden' cod and a sample of cod of typical pigmentation [Gadus morhua morhua L.] captured in the Svalbard Bank

67%
Wiecaszek B., Antoszek J., Antoszek A.
Electronic Journal of Polish Agricultural Universities. Series Fisheries
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2009
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tom 12
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nr 2
8

Occurrence of anisakid nematodes in Atlantic cod [Gadus morhua] and Greenland cod [Gadus ogac], West Greenland

67%
Mouritsen K. N., Hedeholm R., Schack H. B., Moller L. N., Storr-Paulsen M., Dzido J., Rokicki J.
Acta Parasitologica
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2010
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tom 55
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nr 1
81-89
9

Annual and spatial variability in endo- and ectoparasite infections of North Sea cod (Gadus morhua Linnaeus, 1758) larvae, post-larvae and juveniles

67%
Mehrdana F., Bahlool Q. Z. M., Skovgaard A., Kuhn J. A., Kania P. W., Munk P., Buchmann K.
Acta Parasitologica
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2014
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tom 59
|
nr 2
A parasitological investigation was performed on a total of 5380 Atlantic cod larvae, post-larvae and small juveniles sampled from the North Sea during a period of five years. The copepod Caligus elongatus (Von Nordmann, 1832) and the nematode Hysterothylacium aduncum (Rudolphi, 1802) were found at a relatively high prevalence of infection (4.6% and 5.2%, respectively). The infection by both parasites showed annual and spatial variability. C. elongatus showed a higher prevalence in 1992 compared to the following years, whereas the prevalence of H. aduncum increased from 1992 to 2001.We observed a relation between parasite distribution and parameters such as latitude and water depth. Adult digeneans (Lecithaster gibbosus and Derogenes varicus) and larval cestodes were also found with lower infection rates. Since changes of infection levels coincided with increasing North Sea water temperature in the studied period, it is hypothesized that temperature may affect parasite population levels. However, it is likely that other environmental factors may contribute to the observed variations. Absence of infection intensities higher than one nematode per fish in small larvae and post-larvae suggests that host survival may be affected by a high infection pressure. The relatively high levels of infection in the younger stages of cod, and the annual/spatial variability of these infections should be considered in the understanding of the early life dynamics of the species.
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