Penaeus aziecus azlecus Ives — Continued 

 Study material — Continued 



United States — Continued Page 



Maryland 529 



Virginia 529 



North Carolina 529 



South Carolina 529 



Georgia 529 



Florida 529 



Alabama 530 



Mississippi 530 



Louisiana 530 



Texas 530 



Mexico 530 



Tamaulipas 530 



Veracruz 530 



Campeche 530 



Diagnosis 531 



Description 531 



Rostrum 531 



Carapace 53 1 



Antennules 531 



Antennae 531 



Thoracic appendages 532 



Abdomen 532 



Petasma 532 



Appendix masculina 533 



Thelycum 533 



Color 533 



Distribution and morphological variations 534 



Relationships 537 



Reproduction 539 



Subadult stage-sexual maturity 539 



Copulation 54O 



Ovary development 540 



Spawning 54O 



Sex ratio 541 



Postembryonic development 541 



Larvae, postlarvae, and juveniles 541 



Growth 541 



Sex differences in size 542 



Ecology 542 



Food 542 



Substrate 542 



Diel cycle 542 



Movements 543 



Effects of temperature 544 



Effects of salinity 545 



Enemies and diseases 546 



Commercial importance 546 



Penaeus aztecus siibtilis P^rez Farfante 546 



Study material 546 



Diagnosis 546 



Description 547 



Rostrum 547 



Carapace 547 



Antennules 547 



Antennae 547 



Thoracic appendages 547 



Abdomen 549 



Petasma 549 



Appendix masculina 549 



vn 



