DAO 81:241-247 (2008)  -  DOI: https://doi.org/10.3354/dao01957

Effects of emersion and re-immersion on physiological and immunological variables in creel-caught and trawled Norway lobster Nephrops norvegicus

C. J. Bernasconi, R. F. Uglow*

Department of Biological Sciences, University of Hull, Hull HU6 7RX, UK
*Corresponding author. Email:

ABSTRACT: Immune defence in creel-caught and trawled Nephrops norvegicus was investigated to assess a possible relationship between phenoloxidase (PO) activation and the total haemocyte count (THC). Capture, capture method and emersion evoked physiological and immunological responses that may have implications for the ability of N. norvegicus to survive the effects of such stressors. Haemolymph THC was always negatively related to PO activity in the trawled samples, suggesting a decreased level of the plasma serine proteinase inhibitors which reportedly regulate the ProPO system (Le Moullac et al. 1998; Fish Shellfish Immunol 8:621-629). In contrast, creel-caught samples showed increased levels of both PO and THC (cf. control N. norvegicus), after a 12 h emersion period. Trawling and emersion evoked progressive and significant increases (p < 0.05) in the mean levels of haemolymph L-lactate, glucose and total ammonia. The evidence of overt activity and measured haemolymph parameters suggest that creel fishing yields N. norvegicus that are more likely to survive post-harvest treatments than those that are trawled.


KEY WORDS: Nephrops norvegicus · Immune defence · Catching methods · Emersion · Immersion · Intrinsic quality maintenance


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Cite this article as: Bernasconi CJ, Uglow RF (2008) Effects of emersion and re-immersion on physiological and immunological variables in creel-caught and trawled Norway lobster Nephrops norvegicus. Dis Aquat Org 81:241-247. https://doi.org/10.3354/dao01957

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