The present study describes the development of the axial musculature in first-feeding larvae of A... more The present study describes the development of the axial musculature in first-feeding larvae of Atlantic cod (Gadus morhua L.) with different somatic growth rates achieved by using different nutritional conditions. Muscle growth was assessed by determining the number of muscle fibres (hyperplasia) and the growth of existing fibres (hypertrophy). Larvae were fed rotifers containing a high (1. 4; treatment 1) or low (0.2; treatment 2) ratio of docosahexaenoic acid to eicosapentaenoic acid from day 5 after hatching. From day 17, the larvae were fed Artemia nauplii with the same enrichment in both treatments. Treatment 1 gave the highest somatic growth rate and hence the highest dry mass at the end of the experiment, but no difference in larval standard length was found between treatments. In slow-growing larvae, higher priority was thus put into reaching a certain length than into increasing muscle mass. The largest fibres, which were present from hatching, increased in cross-sectional...
... Surveys with plankton nets at different depths in several halibut spawning areas suggest that... more ... Surveys with plankton nets at different depths in several halibut spawning areas suggest that both eggs and larvae are bathypelagic (ROL-LEFSEN 1934; VEDEL-TANING 1936; DEVOLD 1938, 1939, 1943). ... 1974; 0IESTAD & HAUGEN 1980; RUS-VESTER-GAARD in press). ...
Abstract The toxicity of the various hydrocarbons and oil-related compounds varied with fish spec... more Abstract The toxicity of the various hydrocarbons and oil-related compounds varied with fish species and developmental stages tested. Generally cod embroys were most sensitive. Seawater soluble components from crude oil were less toxic than components from photooxidized and weathered oil. Single aromatic hydrocarbons varied in toxicity depending upon the number and molecular position of methylated groups. Cytological studies revealed chromosomal aberrations in exposed embryos.
Pancreatic bile salt-dependent lipase (BSDL) was present with 0·5 μg BSDL larva 1 from hatching i... more Pancreatic bile salt-dependent lipase (BSDL) was present with 0·5 μg BSDL larva 1 from hatching in turbot larvae. The enzyme content increased during the yolk sac phase to 1·1 μg BSDL larva 1. This suggests that larval turbot are able to digest lipids from the start of exogenous ...
Comparative Biochemistry and Physiology Part D: Genomics and Proteomics, 2007
In mammals, the activin receptor type IIB (ActRIIB) binds with high affinity several members of t... more In mammals, the activin receptor type IIB (ActRIIB) binds with high affinity several members of the transforming growth factor-beta (TGF-beta) superfamily, including the negative muscle regulator myostatin (MSTN). In this study, an actRIIB cDNA of 1443 bp was isolated by reverse transcription (RT)-PCR from the liver of Atlantic salmon (Salmo salar) encoding almost the complete receptor. The deduced salmon ActRIIB of 481 amino acids (aa) contained the conserved catalytic domain of serine/threonine protein kinases, and showed the highest sequence identity (83-87%) to the zebrafish, chicken and goldfish ActRIIB. Salmon actRIIB mRNA was identified by RT-PCR in all the examined tissues of juvenile fish that was confirmed by in situ hybridization. In comparison, the salmon MSTN signal was less widespread, and co-expression of the receptor and this putative ligand was only demonstrated in skeletal muscle. Consistently, both ActRIIB and MSTN were immunocytologically identified in salmon myoblasts and differentiated myotubes in culture.
... However, we have little or no information on con-trolled reproduction and recruitment for man... more ... However, we have little or no information on con-trolled reproduction and recruitment for many of the approximately ... be responsible for regulation of the spermatogenesis (development of sperm cells), it stimulates the development of secondary male sexual characters, and ...
The present study describes the development of the axial musculature in first-feeding larvae of A... more The present study describes the development of the axial musculature in first-feeding larvae of Atlantic cod (Gadus morhua L.) with different somatic growth rates achieved by using different nutritional conditions. Muscle growth was assessed by determining the number of muscle fibres (hyperplasia) and the growth of existing fibres (hypertrophy). Larvae were fed rotifers containing a high (1. 4; treatment 1) or low (0.2; treatment 2) ratio of docosahexaenoic acid to eicosapentaenoic acid from day 5 after hatching. From day 17, the larvae were fed Artemia nauplii with the same enrichment in both treatments. Treatment 1 gave the highest somatic growth rate and hence the highest dry mass at the end of the experiment, but no difference in larval standard length was found between treatments. In slow-growing larvae, higher priority was thus put into reaching a certain length than into increasing muscle mass. The largest fibres, which were present from hatching, increased in cross-sectional...
... Surveys with plankton nets at different depths in several halibut spawning areas suggest that... more ... Surveys with plankton nets at different depths in several halibut spawning areas suggest that both eggs and larvae are bathypelagic (ROL-LEFSEN 1934; VEDEL-TANING 1936; DEVOLD 1938, 1939, 1943). ... 1974; 0IESTAD & HAUGEN 1980; RUS-VESTER-GAARD in press). ...
Abstract The toxicity of the various hydrocarbons and oil-related compounds varied with fish spec... more Abstract The toxicity of the various hydrocarbons and oil-related compounds varied with fish species and developmental stages tested. Generally cod embroys were most sensitive. Seawater soluble components from crude oil were less toxic than components from photooxidized and weathered oil. Single aromatic hydrocarbons varied in toxicity depending upon the number and molecular position of methylated groups. Cytological studies revealed chromosomal aberrations in exposed embryos.
Pancreatic bile salt-dependent lipase (BSDL) was present with 0·5 μg BSDL larva 1 from hatching i... more Pancreatic bile salt-dependent lipase (BSDL) was present with 0·5 μg BSDL larva 1 from hatching in turbot larvae. The enzyme content increased during the yolk sac phase to 1·1 μg BSDL larva 1. This suggests that larval turbot are able to digest lipids from the start of exogenous ...
Comparative Biochemistry and Physiology Part D: Genomics and Proteomics, 2007
In mammals, the activin receptor type IIB (ActRIIB) binds with high affinity several members of t... more In mammals, the activin receptor type IIB (ActRIIB) binds with high affinity several members of the transforming growth factor-beta (TGF-beta) superfamily, including the negative muscle regulator myostatin (MSTN). In this study, an actRIIB cDNA of 1443 bp was isolated by reverse transcription (RT)-PCR from the liver of Atlantic salmon (Salmo salar) encoding almost the complete receptor. The deduced salmon ActRIIB of 481 amino acids (aa) contained the conserved catalytic domain of serine/threonine protein kinases, and showed the highest sequence identity (83-87%) to the zebrafish, chicken and goldfish ActRIIB. Salmon actRIIB mRNA was identified by RT-PCR in all the examined tissues of juvenile fish that was confirmed by in situ hybridization. In comparison, the salmon MSTN signal was less widespread, and co-expression of the receptor and this putative ligand was only demonstrated in skeletal muscle. Consistently, both ActRIIB and MSTN were immunocytologically identified in salmon myoblasts and differentiated myotubes in culture.
... However, we have little or no information on con-trolled reproduction and recruitment for man... more ... However, we have little or no information on con-trolled reproduction and recruitment for many of the approximately ... be responsible for regulation of the spermatogenesis (development of sperm cells), it stimulates the development of secondary male sexual characters, and ...
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