Keep out of reach of children. Not to be used on fish intended for human comsumption.
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(Below was Test result published atmanufacturer's website apifishcare.com)
The effect of Stress Coat? on the excretory loss
of cortisol from the common goldfish
Carassius auratus followinga netting stressor
Introduction
Stressis an important issue in the successful husbandry of captive fish and is often
usedas an indicator of health and welfare. Husbandry practices can impose stress
onfish including handling, grading, transportation and poor management of water
quality.Exposure to stress evokes a series of physiological responses in fish, the
primaryresponse involving the release of stress hormones into the circulatory system.
Theprincipal corticosteroid released is cortisol. This is excreted via branchial
andurinary pathways, and can therefore be measured using non-invasive methods
throughwater sampling. Currently a commercial product STRESS COAT is available
foruse with ornamental fish (both in the trade and for pet owners). This
productincludes a botanical extract of the plant Aloebarbadensis and is frequently
usedduring transportation, water changes and when setting up an aquarium. Its
primaryuse is as a water conditioner; however, anecdotal evidence has suggested
itmay also have a role in managing the stress response in fish.
METHODS
?Twelve goldfish were graded into each of 15 x 50L aquaria, tank biomass
rangedfrom 104.02 - 109.16g.
?During the trial fish were not fed and tanks were ?stand alone? held at 22?C.
?Three treatments were tested -
1)Control, no netting stress and no STRESS COAT
2)Post-treatment with STRESS COAT after netting stress
3)Subjection to netting stress with no STRESS COAT
?The netting stressor consisted of aerial exposure for 30 secs followed by net
confinementwithin the tank for 30 secs - repeated four times.
?Water samples were collected hourly for 8 hours and analysed via waterextraction and RIA according to
Elliset al (2004).
RESULTS
?Recorded cortisol levels are cumulative.
?All treatments are statistically significantly different from each other.
?The control fish had the lowest excreted cortisol levels followed by those thatwere treated with
STRESSCOAT. Untreated stressed fish excreted the highest cortisol levels.
AIM
Toassess the stress reducing properties of STRESS COAT by measuring water bornecortisol excreted from
goldfishCarassius auratus following a netting stressor.
We have a chemistry with fish.?
The effect of Stress Coat? on the excretory loss
of cortisol from the common goldfish
Carassius auratus following a netting stressor
Effectof STRESS COAT? on the release of cortisol from goldfish following a nettingstressor (each
treatmentbeing significantly different, ANOVA, P<0.05).
Discussion
Inthe presence of STRESS COAT fish appeared to recover from the stress responsefaster than those not
exposed.The initial response to a stressor is an increase in mucus production. Howevera few hours poststress
areduction in the number of goblet cells can lead to a thinning of the mucuslayer, possibly leaving the
fishin homeostatic difficulty. Biochemical constituents of Aloe and fish mucus aresimilar both comprising of
glycoproteins,monosaccharides and minerals. Molecules derived from the Aloe extract maydeliver important
mucincomponents that aid in the maintenance of the mucus layer possibly by providinga replacement
protectivelayer on the fish during and following the stress response.
Thelow cortisol levels in this study may be attributed to the elution liquidchosen for the water extraction.
Thisstudy used ethyl acetate as opposed to alcohol, which extracts only free andnot a combination of free
andconjugated steroids from the water.
DonnaL. Snellgrove, Steven M. Priestley, and Lucille G. Alexander
WALTHAMCentre for Pet Nutrition, Waltham-on-the-Wolds, Melton Mowbray, Leicestershire,UK
Posted with
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