Invincible Wellbeing’s Planetary Animal Welfare Survey (PAWS) spreadsheet is, to the best of my knowledge, the most comprehensive literature review of neuron count estimates across animal species. Despite this, only two fish species, both weighing less than one gram, appear in PAWS.
Do you mean less than 1 kg? Less than 1 g seems super low for a fish.
Nevermind. I see zebrafish can be that light. From Siccardi III et al. (2009), “Mean weights for zebrafish fed the other diets ranged between 70.6 mg (Cyclop-eeze) and 178.5 mg (TetraMin Tropical Flakes)”.
Hi Matt.
Do you mean less than 1 kg? Less than 1 g seems super low for a fish.
Nevermind. I see zebrafish can be that light. From Siccardi III et al. (2009), “Mean weights for zebrafish fed the other diets ranged between 70.6 mg (Cyclop-eeze) and 178.5 mg (TetraMin Tropical Flakes)”.