What is the likely trade-off that bluegill sneaker males make according to the data on sperm longevity and density below? In one sentence,speculate on a possible constraint as a reason for this trade-off. 
Definitions:
Scrotum
The pouch of skin and muscle that houses the testicles in males, regulating temperature for optimal sperm production.
Endodermal
Pertaining to the innermost layer of the three primary germ layers in the very early embryo, which gives rise to the digestive and respiratory systems among others.
Ectodermal
Pertaining to the ectoderm, the outermost layer of the embryo, giving rise to the nervous system, skin, and various sensory organs.
Germ Layers
The three primary layers of cells (ectoderm, mesoderm, and endoderm) in the early embryo from which all tissues and organs develop.
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