کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6385348 | 1626790 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrical immobilisation of saithe (Pollachius virens): Effects of pre-stunning stress, applied voltage, and stunner configuration
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electrical immobilisation of saithe (Pollachius virens): Effects of pre-stunning stress, applied voltage, and stunner configuration Electrical immobilisation of saithe (Pollachius virens): Effects of pre-stunning stress, applied voltage, and stunner configuration](/preview/png/6385348.png)
چکیده انگلیسی
Electrical stunners have been introduced on some Scottish seiners in Norway to facilitate easier handling of fish in connection with the bleeding operation. Evaluation of stunning efficiency of Atlantic cod, haddock and saithe at sea has been successful for cod and haddock. In contrast, electrical stunning of saithe can result in broken spines and blood spots for a certain fraction of a catch. A controlled experiment was therefore carried out with saithe where the goal was to minimize the detrimental effects of electrical immobilisation. Since two configurations of the electrical stunner are in use on different vessels, we studied stunner configuration and voltage (40, 70 and 100Â V) as variables. In addition, we hypothesized that post-capture remaining energy for contraction of white muscle (pre-stunning stress), stimulated by electricity, could be a factor to consider related to the occurrence of spinal fractures. Fish behaviour, eye-roll (VOR), and recovery time were used as indices of stunning efficiency. Effects of stress on white muscle were assessed by changes in initial pH, twitch ability, and blood lactate levels. The results showed that regardless of pre-immobilisation stress level, stunner configuration, and voltage, all fish responded instantly upon exposure to electricity. Absence of VOR indicated that the fish were unconscious as assessed immediately after immobilisation. However, after 10Â min of recovery in seawater, many fish in all experimental groups regained consciousness. Compared with rested fish (control), blood lactate, white muscle initial pH and twitch ability were affected by pre-immobilisation stress and subsequent fish handling procedures. Neither stunner configuration nor applied voltage fully solved the problem with spinal fractures and blood spots in saithe. To minimize the problem though, the current research showed that the best stunner configuration was to use the conveyor belt as counter electrode rather than using alternating charge on adjacent rows of electrodes. Furthermore, fish subjected to pre-immobilisation stress also reduced the probability for spinal fractures and blood spots. More research is nevertheless necessary to eradicate the problem altogether.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fisheries Research - Volume 179, July 2016, Pages 148-155
Journal: Fisheries Research - Volume 179, July 2016, Pages 148-155
نویسندگان
Ulf Erikson, Hanne Digre, Leif Grimsmo,