International Journal of Fisheries and Aquatic Research

International Journal of Fisheries and Aquatic Research


International Journal of Fisheries and Aquatic Research
International Journal of Fisheries and Aquatic Research
Vol. 4, Issue 4 (2019)

Moisture content, weight loss and anti-oxidative stress enzyme activities in muscles of insect infested- smoked fishmeal compared with commercial fishmeal


Ezike CO, Okechukwu GCE, Agbo AN

The present research on pest infestation of smoked dried fishmeal’s from catfish, croakers and tilapia compared to commercial fish meal were carried out to access the effect of exposed preserved fish product to adult Dermestes maculatus. The aim of the study was to determine the effects of the insect on smoked fish with respect to moisture content, weight loss and anti-oxidative enzyme activities of muscle tissue. The research was carried out at the Fisheries unit of ESUT Teaching and Research Farm, Agbani. The fish specimens used were gutted after which their carcass was washed and smoked in a kiln for 6 hours. Four treatments comprised of fish meal which served as control and fish meals of the 3 species were replicated three times. Five adult Dermestid beetles were introduced to each of the replicate and the experimental duration lasted for 3 weeks. Differences in moisture content were shown in week 2 and 3 between tilapia and control and the other 2 fishes with control on week 3. The weight loss recorded no significant difference (P > 0.05) among all the treatments and the control throughout the experiment but showed evidence of weight reduction with increase in exposure time. Superoxide dismutase (SOD) was significantly higher (P < 0.05) in all treatments compared to the control. The highest value of 1.8463 U mg protein -1 was recorded in tilapia fish on the week 3 while the least value was recorded in croaker 0.7327 U mg protein -1 on week 1. The LPO was significantly different (P < 0.05) in all the treatment weeks with highest value in catfish on week 3 (0.5020 mMole/TBARS/ mg protein). Catalase activity was significantly elevated (P < 0.05) in tilapia compared to the control. The highest value of CAT was recorded to be 0.6240 umol mm-1 mg protein-1 in tilapia on week 3, while the least value of 0.1050 umol mm-1 mg protein-1 was recorded in croaker on week 1. Differences existed between control and treatments in respect of the oxidative stress enzymes activities and showed evidence of elevation of LPO in catfish compared to the control. The results of this study showed that the weight loss of infested fish decreased with increase in storage time and did indicate that tissue moisture content and peroxidation of smoked fish samples was related to the infestation and exposure time. Thus, the longer the period of storage of infested smoked fish, the more the moisture and oxidative stress. Catfish, croaker and tilapia enhanced CAT and SOD levels when exposed to Dermestes maculatus. Storage of smoked Fish should be for a short period of time not longer than 2 weeks to avoid pest infestation which results to increased peroxidation and moisture. There is however the need for further studies to reveal the DNA damage, haematology and other biochemical effects.
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How to cite this article:
Ezike CO, Okechukwu GCE, Agbo AN. Moisture content, weight loss and anti-oxidative stress enzyme activities in muscles of insect infested- smoked fishmeal compared with commercial fishmeal. International Journal of Fisheries and Aquatic Research, Volume 4, Issue 4, 2019, Pages 39-41
International Journal of Fisheries and Aquatic Research