Came across this in my daily Science Daily reading- keeping big fish

[MakoMike]

Originally Posted by BassDawg

What you're talking about is called senescense- biological aging. It's a common theory used among fishermen to justify keeping large fish. One old cow is not as fertile as two younger females, and therefore it's better to have more 20-30 lb fish in the population, and OK to keep the large ones.

Unfortunately this is comparing fish to people- they aren't. There's surprisingly little research done on striped bass fecundity (the ability to reproduce), which is weird seeing as they're such a valuable and important fish. One study by Richards, Fogarty & Teichberg (Density-dependent Growth and Reproduction of Chesapeake Bay Striped Bass) found that as the total length and weight of striped bass increased, fecundity increased. Monteleone & Houde at UMD also did a study entitled Influence of maternal size on survival and growth of striped bass Morone saxatilis Walbaum eggs and larvae- they found that small females produced small larvae, while large females produce large ones. Additionally, the larvae from large females grew faster than those from the smaller ones. They did note that a significant difference in survival to 25 days post hatch was not noticed.

So what does that mean? Large fish produce more fertile and viable eggs than small fish, and large fish produce larger larvae that grow faster. In a laboratory setting, survival was not influenced by female size... However in the wild the larger you are when born and the faster you grow will have a direct effect on survival (less things can eat you).

Note how his conclusion is directly contradicted by the study he is citing?