Serum biochemical profiles of captive and wild northern bluefin tuna (Thunnus thynnus L. 1758) in the Eastern Mediterranean

Abstract

Northern blue¢n tuna (NBT) are a prominent marine pelagic ¢sh species. There are few reference values for their blood chemistry and this is the ¢rst report to demonstrate blood biochemical values in the Eastern Mediterranean. The study was carried out with 60 captive (penned) and 60 wild NBTs from Ildir Bay (Izmir) and Antalya Bay in the Eastern Mediterranean, from winter to early summer 2003. The aim of this research was to determine the biochemical parameters of wild male/female and captive male/female NBTs. According to the present results, the blood biochemical values of the captive NBTs were signi¢cantly higher than those of wild NBTs (Po0.05) except albumin, globulin, total protein and very lowdensity lipoprotein levels. Moreover, many of the biochemical parameters were detected at high levels in captive and wild male NBTs than those of the females. Especially, the values of glucose, lactate dehydrogenase, creatine phosphokinase, g-glutamyl transferase, cholesterol, triglyceride, low-density lipoprotein, ferritin, transferrin and iron levels were signi¢cantly higher, although high-density lipoprotein values were signi¢cantly lower in wild and captive male samples than those of both groups of females (Po0.05).

Biochemical and hematological parameters in European sea bass (Dicentrarchus labrax Linnaeus, 1758) and Gilthead sea bream (Sparus aurata Linnaeus, 1758) in relation to temperature

“…Therefore it is necessary to develop control strategies based on a better understanding of the effects of environmental stressors on the health status of farmed fish (BOWDEN et al, 2007). The study of the hematological and biochemical parameters in cultured fish species is an important tool in the development of aquaculture systems (O'NEAL and WEIRICH, 2001;PERCIN and KONYALIOGLU, 2008;MAURI et al, 2011). These parameters provide information not only about the health status of fish and the water quality in which they live, but also help to foresee, at some level, the susceptibility of organisms to changes in environmental conditions (PERCIN et al, 2010;AYOOLA et al, 2011).…”

SERUM BIOCHEMISTRY OF FARMED BLUEFIN (Thunnus thynnus L.) IN THE AEGEAN SEA

“…Female hormones and related protective factors make females more strong and resistant to stress factors and external influences, which could cause liver function tests to appear lover in females. Albumin, urea, uric acid and creatinine values did not show any significant variations between males and females, which shows that physiological structure of female and male metabolisms are similarly affected [3,8,9 and 10]. It follows from cholesterol profile that there were differences between males and females.…”

“…Fattening farms experience such sudden mass mortalities. As a result, fishes die prior to being harvested with significant losses in terms of economy [3,6,9, and 11]. Comparison between male and female fishes shows that females seem more resistant to stress levels than males (Table 2).…”

Species-specific welfare aspects of the main systems of stunning and killing of farmed tuna

“…It seems that overfeeding is a common practice, obviously because the feeding is at satiety (Aguado and García-García, 2005). At the end of the fattening period, weight of the fish increased by 25 -35% (Percin and Konyalioglu, 2008).…”

“…The literature related to stress in reared bluefin tuna, mainly refers to the evaluation of physiological measures related to repeated sampling disturbance (Thomas et al, 2003), confinement (Dyer et al, 2004), stocking density and crowding stress (Percin & Konyalioglu, 2008). There are also some papers on the evaluation of levels of stress determined by different slaughtering methods and its effect on meat quality (Soto et al, 2006;Messina & Santulli, 2007) (see Section 5).…”