For now, I share a quote regarding the effect of the human fall upon the rest of creation – from a lovely little book called Living with the Animals: The Community of God’s Creatures, by Charles Birch & Lukas Vischer:

“God’s creation is so designed that one part depends on another. Life is born from life. Life must come to an end so that new life can begin. The creation is characterized by constant dying away and coming into being. It lives by the continual sacrifice of living things. All living things – humans, animals and plants – share in this process, each in its own way. They all pass away and serve one another by their passing away. All form part of the vast sacrifice that life as a whole makes possible. In the end, no part of the whole can escape this common feature of creation.

By rejecting God, however, humans bring a new dimension into this factual state of affairs. They upset the fragile equilibrium of all creation in order to establish and implement their rule. Having exceeded the boundaries laid down for them, they then make humankind the centre of their universe to such a degree that they lose sight of the community of creation as God intended it to be. They believe that the only purpose of living creatures, animals and plants is humanity as the centrepoint of creation. The use of violence is taken as self-evident. The basic rule of creation is perverted. Instead of producing new life, humans work death and destruction.” (p.13)

• Someone a lot more biologically inclined than myself could (probably? if indeed such short-lived organisms exist?) give examples of fast-reproducing organisms (microbes, gnats, etc.?) whose life-spans are only a few hours, and thus would have died on the same day of their creation.
• According to ‘mature creation’ theory (creation created ‘mature’ – light already in transit from distant stars, trees with [very misleading!] annual rings only moments old, etc.), there would have been very, very ‘mature’-slash-about-to-die birdies and fishies created, some of which – conceivably – would have died on the same day of their creation.
• Also, unless not one, single, fish-eating bird dipped down and tasted of the delicious bounty of the shimmering little fishies below, at least some fish would have died on the same day of their creation.

Beyond conceivable doubt, even given a 24-hour day understanding of creation (with 6, successive acts of ‘spontaneous creation’), there would have been physical death before the events of Genesis 3.

((note: I see no reason to doubt that the text of Genesis 1 was originally a poem/song expressing theological truths, as opposed to being a play-by-play, moment-by-moment, fact-by-fact account of the ‘how’ of creations’ origin.  Thus, the nit-picking-ly detailed exercise above ought to be unnecessary – but is merely noted in reference to those who insist that there could have been no death before the Fall.))