"This fair value is the amount which could be expected to be...

"This fair value is the amount which could be expected to be received from the disposal of an asset in an active and liquid market, less the costs expected to be incurred in realising the proceeds of such dispoal"

How much do you think they'd get for 10 million smaller fish? I'd hazard a guess that the total value would go down, which doesn't gel with the valuation of the biological assets either. (The 'fair value adjustment to biological assets' was +$10m for the half)