Answers are grounded in this paper and cite their sources.
A chemically specific analysis for plasma thyroid hormones has been used to disclose a seasonal bimodality in the concentrations of thyroxine (T4) and triiodothyronine (T3) in the plaice; maxima in both hormone levels occur in winter and in summer. The ratio of T4 concentrations to T3 varies seasonally being at a minimum in summer. A highly significant correlation of T4 plasma levels with the landings per unit fishing effort for the same area has been observed.
No takes yet. Share an insight, caveat, or question.
Osborn et al. (1978) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: