Recently, this homework question was asked here:
It is about fish growth modeled by a simple logistic growth function. According to the "What is ontopic" page, this question is not on topic.
On the first look, the question looks like a biology question. However, in my opinion, it is rather a mathematical question on working with dynamical systems. Currently, the Earthscience.SE seems to be the most appropriate site for this question except for Physics.SE. The people, who are active on these sites have the mathematical background knowledge.
There might be more questions on modeling marine biogeochemical processes (fish-algae-nutrients-physics-systems) coming in future. The modeling of population dynamics was "invented"/introduced by physicists and mathematicians. Although the application of these models is in the field of biology, the actual tools are often not mastered by biologists but by earth-scientists. Hence, technical question on population dynamics and biogeochemical processes might be reasonably answered here. Do we accept these questions here? If not, is there another Stackexchange site, to which we can redirect them?