Freezer conditions
120 In summary, the respondent contends that defects afflicting the prawns were caused by improper freezer conditions in the facilities of VersaCold. In particular, the unpalatable saltiness and muddy taste of a significant number of the relevant prawns was, in the respondent's submission, caused by these conditions.
121 It is not in dispute that an unidentified number of the relevant prawns were of unpalatable saltiness. In his expert report Mr Perkins, who personally inspected the relevant prawns, said that a number of prawns in over 50% of the cartons he inspected (17 out of 31 cartons) "were either so bad tasting or so extremely salty they were unable to be consumed". This evidence is not rebutted by the respondents.
122 The respondent contends that the applicant did not plead the saltiness of the relevant prawns. I do not accept this proposition. At paragraphs 26 and 27 the applicant pleads that the relevant prawns did not have a sweet flavour and (at para 27) that this was one of the reasons for rejection of the prawns by Woolworths.
123 To the extent that the respondent accepts that some of the relevant prawns were of unpalatable saltiness, its case relied upon the evidence of Mr Winkel and Dr Anderson. In summary, this case was:
If there had been a "second skin" in respect of relevant prawns at the time or processing, this would have been identified by Mr Lewis when he visited the respondent's farm on 9 November 2007.
Extended freezer storage of 14-18 months would result in the presence of a "second skin" in respect of prawns that were individually quick frozen, and difficulty in peeling them.
As explained by Mr Winkel, as flesh denaturisation occurs over time in frozen storage, water is lost from the flesh commencing from the outside moving inwards towards the centre of the prawn. The flesh retracts or shrinks and the prawn becomes harder to peel, developing what appears to be a "second skin".
Dr Anderson gave evidence that frozen prawns must be stored at a consistent temperature of between -18ºC and -25ºC. His evidence was, in summary, that:
even slight fluctuations of one or two degrees in temperature can negatively affect the quality of frozen prawns in a number of ways;
one impact of fluctuations in temperature on the prawns is to cause sublimation of the glaze, allowing the prawns to oxidise and cause the prawn to darken, particularly around the gills and legs; and
another impact of fluctuations in temperature is to cause the prawn cartilage to toughen underneath the outside shell, making the prawn difficult to peel once thawed (and creating the "second skin").
Although Mr Eric Dixon, the National Facilities and Engineering Manager for VersaCold, gave evidence that records for the VersaCold facilities do not show significant fluctuations in temperature:
Mr Dixon accepted that the product could be harmed if there was an extensive fluctuation of temperature of the actual product;
there is no evidence of the actual product temperature, only the temperature within the storage facility; and
there is no first-hand evidence as to where the relevant prawns were located in the VersaCold storage freezers.
It is not in dispute that the large/jumbo prawns produced at the same time as the relevant prawns were easy to peel.
124 The applicant presented an alternative explanation to account for the saltiness of the relevant prawns, based on evidence of its expert Mr Perkins. Mr Perkins' opinion as to the cause of the extreme saltiness (as set out on pp 16-17 of his expert report) was as follows:
The extreme saltiness was caused by the prawns having 2 shells and brine had got between the shells during the brine freezing process and was not washed off or out of the flesh during the thawing process.
The ability to peel the prawns in all of the boxes ranged from extremely difficult to difficult. The samples tested in all cases were the prawns that were not classified as rejects in that box. The soft prawns, the rough skinned and the red shell prawns were extremely difficult to peel as most of them had 2 shells… Some rough shelled prawns were easy to remove the outer shell - but had a second shell under that was 'welded' to the flesh and impossible to remove. These prawns were also characterised by very high salt content - the brine from the brine freezing process may have got between the shells and been absorbed into the flesh.
125 In my view the case put by the applicant is substantiated by the material before the Court. I form this view for the following reasons.
126 First, there is ample evidence before the Court that significant numbers of the relevant prawns were defective at the time of processing at the respondent's farm. In particular:
The respondent's recorded harvest notes, some of which I have extrapolated earlier in this judgment, indicate extensive scarring, burst livers and soft and broken shells in prawns at the time of processing.
The diseases commonly afflicting farmed prawns are not in dispute.
There is evidence of Mr Corbett as to the "furriness" of significant numbers of prawns harvested during that season because of protozoan growth affecting them, and the need for those prawns to be treated with a citric acid bath to remove such growth (potentially causing burst livers in such prawns).
There is no evidence before the Court to support a finding that the citric acid bath, used by the respondent to remove the "furriness" associated with protozoan growth, would in any way have alleviated or affected the existence of any "second skin" created by the inability of prawns to successfully moult their outer shell.
127 Second, and in light of this evidence, the explanation of Mr Perkins for the excessive saltiness and the "second skin", namely that those prawns with excessive saltiness had been unable to successfully moult their shell, is completely plausible.
128 Third, the respondent's claim that Mr Lewis would indubitably have been able to detect the "second skin" in respect of the relevant prawns on 9 November 2007 does not stand up to scrutiny in light of the facts that:
Mr Lewis's inspection on that date was, as the evidence demonstrates, superficial; and
importantly, the applicant does not claim that all the relevant prawns were afflicted by a "second skin" resulting in inability to peel, or unpalatability in taste. The applicant claims that the relevant prawns did not comply with the Woolworths Specifications because, in summary, tolerance levels in respect of defects were breached. This claim is consistent with the evidence before the Court that some of the relevant prawns were edible/acceptable. It is also consistent with the inference that may be drawn from the evidence before the Court from, for example, Mr Corbett's evidence, that not all processed prawns were afflicted by conditions such as protozoan growth.
129 Fourth, I am not satisfied that the prawns were frozen for an excessive length of time thus causing denaturisation of prawn flesh and a "second skin". In this respect I give greater credence to the opinion of Mr Perkins in respect of the relevant prawns than that of Mr Winkel and Dr Anderson. I form this view because:
In my view the manner in which Mr Perkins inspected the prawns, namely by examining one carton from each batch code, being in total 31 cartons, was an acceptable approach to inspection. This is particularly so given both the volume of prawns involved, and the fact that inspecting the prawns invariably necessitated thawing and eating them, rendering prawns subject to such assessment commercially valueless.
It appears that not all the relevant prawns had the so-called "second skin". If the explanation proffered by Mr Winkel and Dr Anderson for the existence of this second skin, namely the "denaturisation process", was valid, it might be expected that all the relevant prawns would have been so affected. Indeed, this appeared to be an assumption forming the basis of Mr Winkel's opinion, as became evident during cross-examination, but which was a false assumption (transcript 23 June 2011 p 173 ll 3-18).
Mr Perkins actually personally examined the relevant prawns. To that extent, I consider his opinion as to the condition of the relevant prawns has greater weight than the opinion of experts who have only viewed photographs of the relevant prawns, and read third party descriptions of their condition.
Because Mr Perkins personally examined the relevant prawns, he was also able to comment on the taste and odour of the prawns. In particular, Mr Perkins noted in his report that:
The boxes of frozen prawns appear to have been kept under excellent refrigeration conditions as the smell of the frozen prawns while they were in the plastic liner bags was characteristic of 'freshly' frozen prawns. This is an industry accepted indicator of the refrigeration being up to standard. If the refrigeration was not excellent, rather than the smell of the prawns in the cartons being of 'freshly' frozen prawns, the smell would have been old seaweed (on the border of rotting or very stale bread) smell (where mould has started). It is my opinion that the thick liner bags and the consistent freezer temperatures, being excellent refrigeration conditions, have maintained the prawns in the same condition that they were in when they were packed - there was a characteristic frozen prawn smell with no stale or freezer odours.
Importantly, Mr Perkins noted in his report that the prawns with "bad taste" had "an odour the same as other prawns".
Further, Mr Perkins noted from his personal observations of the relevant prawns:
Further, there was no sign of dehydration or freezer burn in any of the cartons.
Mr Winkel conceded that Mr Perkins' explanation for the "second skin" on the relevant prawns was "acceptable", although he preferred his own explanation.
The fact that cooked prawns could be frozen for two years without spoilage was not disputed by expert witnesses for either party. I note evidence to this effect from Dr Anderson (for example, transcript 16 May 2011 p 70 ll 6-21).
130 Fifth, I am not satisfied that the VersaCold freezer storage facilities in which the relevant prawns were stored were in any way defective. Indeed, in my view the submissions of the respondent to this effect were, to coin a cliché, clutching at straws.
131 Those submissions were based on evidence of Dr Anderson in his Witness Statement dated 24 January 2011 and his Supplementary Witness Statement dated 9 March 2011. In summary, Dr Anderson opined that the VersaCold records appeared to show some fluctuations in temperatures on a number of days during storage of the relevant prawns, which fluctuations would be sufficient to negatively affect the quality of frozen prawns including:
sublimation of the glaze, allowing the prawn to oxidise and cause darkening (especially around the gills and legs); and
toughening of the outside shell and creation of a "second skin".
132 In my view this opinion was satisfactorily rebutted by evidence of Mr Dixon, an experienced freezer engineer who was the National Facilities and Engineering Manager for VersaCold Logistics. This evidence demonstrated that:
the VersaCold freezing facilities are large, commercial and sophisticated;
VersaCold had records of precisely where the relevant prawns were stored in its facilities;
thermometers are located in the facilities at certain points in the storage rooms, including several metres above the highest storage racks for frozen goods;
any warm air in the facilities rises, with the result that the temperature at the top of a storage room would be warmer than at floor level, although "warmth" in these storage facilities is relative;
if a person were to open a door to the storage room, warmer air would enter and be reflected in the readings of the thermometers at the top of the storage room;
according to Mr Dixon, there were no issues with the effectiveness of the VersaCold freezing facilities during the time the relevant prawns were stored there; and
the relevant prawns were kept in the lower parts of the freezers, which were colder than at ceiling height.
133 From this evidence I am satisfied that, in fact, any fluctuations in temperature were inconsequential, were in areas of the freezing facilities which were removed from the location of the relevant prawns, and in fact did not affect the relevant prawns. I am not otherwise persuaded by the opinions of Dr Anderson, which were clearly expressed in the absence of awareness of the evidence of Mr Dixon in relation to the features of the VersaCold facilities and the manner in which those facilities operated (cf transcript 23 June 2011 p 175 l 35 - p 176 l 2).