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Reproductive Ecology
Centropumis undecimalis is a protandric hermaphrodite fish species. The common snook’s spawning season appears to span the months of April to October, with the peak spawning occurring during the months of July and August. Spawning typically occurs in near-shore waters with high salinities. Following the spawning period, the juveniles will then migrate to the brackish waters of the nearby estuarine environments. When these juveniles mature they will then return to the higher salinity waters of the open ocean to join the breeding population.

Habitat Ecology
The common snook is an estuarine-dependent fish species. Within estuaries, juvenile common snook are most often found inhabiting areas such as coastal wetland ponds, island networks, and creeks. Despite being a euryhaline species of fish, common snook do show a tendency to gravitate towards lower salinity conditions in the early stages of their life. By being able to adapt and thrive in both high and low salinity conditions through osmoregulation, common snook display a high level of habitat plasticity. Common snook are opportunistic predators whose feeding habits indicate that there is a positive relationship between their size and the size size of their prey, meaning that as the snook grows it feeds on larger and larger prey. Common snook have been found to occasionally engage in cannibalistic activities, though this behavior is rare. This usually occurs during the winter months when adult and juvenile common snook are in close proximity to one another within their estuarine habitats. This form of cannibalism where the juveniles are fed on by the adults is referred to as intercohort cannibalism. The adult common snook who do cannibalize juveniles most likely target them due to the fact that the juveniles may be the largest of the available prey, and are therefore more nutritionally efficient to prey upon.

Physiological Ecology
Common snook, like many species of fish, are very in tune with their environment, meaning that even a slight change in their surroundings can have a significant impact on their behavior. For example, common snook are able to determine when to start and stop spawning based on the temperature and salinity of the water they inhabit, the amount of rainfall in the area and whether or not there is a full moon. However, there are some cases in which disturbances in their environment can have very negative effects on the snook population. One example of this is the devastating results of a cold snap. Snook are very susceptible to cold temperatures, with the effects ranging from the complete halt of all feeding at a water temperature of 14.2˚C, to the loss of equilibrium at 12.7 ̊C, to death at a temperature of 12.5 ̊C. Recently, a cold snap in January of 2010 resulted in a 41.88% decline in nominal abundance of the common snook population in Southwest Florida from the previous year and a 96-97% post-cold event decrease in apparent survival estimates.