Oogenesis 



to 



Poisonous gas 



pollutants 



546 Oogenesis (See also: Germ cell origin and under Egg) 



695 Operant conditioning 

 Opercular openings 



471 Operculum 



Opinion of the International Commission on Zoological 

 Nomenclature (See: Intl Comm opinion on various 

 444 systematic names) 

 489 Optic nerve 

 487 Optic tectum 



696 Optomotor response (See also: Rheotaxis) 

 694 Oral brooding 



520 Oral respiration 

 534 Oral teeth 



Oral valves 



Ordovician 

 524 Organ of Leydig 

 721 Organic pollutants 

 611 Organics in water 



Organogenesis 



Orientation and locomotion (See also: Fish guidance, 

 Galvanotaxis, Home range and homing. Schooling, and 



673 under Mechanical senses) 

 Orientation to bottom 



674 Orientation to floating objects 

 674 Orientation to surface 



674 Orientation with light source 



585 Origin of the tetrapods 



585 Origin of the vertebrates 



742 Otolith age study 



492 Otoliths 



Out of water (See also: Aerial locomotion, Aestivation, 

 Annual fish, Aquatic vs terrestrial respiration, 

 Development out of water, Leaping, Terrestrial 



606 locomotion, and under Accessory respiratory organs) 

 Outdoor census and sampling (See also: Creel census, 



744 Sampling in fisheries) 



548 Ovarian cycles (See also: Reproductive season) 



547 Ovarian endocrine tissue 

 547 Ovarian follicles 



Ovarian germinal tissue 

 545 Ovary 

 716 Overfishing 

 552 Oviduct (See also: Cloaca) 



Ovipositor (See: Female genital papilla) 

 547 Ovulation 



Oxidative metabolism (See also: Metabolic rate and under 

 455 Intermediary metabolism) 

 611 Oxygen 



Oxygen carbon dioxide balance (See also: Aeration in 

 aquaria, Gas transport by blood) 

 447 Oxygen consumption 



Oxygen debt (See also: Exercise and under Intermediary 

 metabolism) 



Oxygen deficiencies in habitat (See also: Stagnant waters, 

 720 Winterkill) 

 519 Oxygen transport (See also: Gas transport by blood) 



Paddlefish (See: Acipenseromorpha) 

 584 Paleocene 

 589 Paleoecology 

 583 Paleozoic 



537 Pancreas 



538 Pancreatic enzymes (See also: Intestinal digestion) 

 515 Pancreatic islets 



Paper chromatography 



Parallelism (See: Convergence and parallelism) 

 501 1 'a ra pineal 

 701 Parasite life history 

 Parasite systematics 

 732 Parasites shared with man 



Parasitism (See: Infectious and parasitic disorders, and 

 other subjects under Pathology and parasitism, as well 

 as various parasitic plant and animal systematic groups) 



693 Parental care of eggs 



694 Parental care of young 

 Parrotfish (See: Scaridae) 



510 Pars anterior 

 Pars distalis 



507 Pars intermedia 



Pars tuberalis (See: Pars anterior) 

 550 Parthenogenesis 

 695 Partial reinforcement conditioning 

 694 Parturition (See also: Viviparity) 

 460 Passive electrical properties 

 460 Passive thermal properties 



Pathology and parasitism (See also: Abnormality of 

 various structures and organs, and under various 

 698 parasitic plant and animal systematic groups) 

 694 Pavlovian conditioning 



445 Pearl organs 



479 Pectoral fin muscles 

 471 Pectoral fin skeleton 



446 Pectoral fins 



469 Pectoral girdle 



479 Pectoral girdle muscles 



Pelagic zone 



Pelvic fin muscles 

 471 Pelvic fin skeleton 

 446 Pelvic fins (See also: Claspers) 



470 Pelvic girdle 



479 Pelvic girdle muscles 



557 Penis (See also: Male genital papilla) 



583 Pennsylvanian 



Perch (See: Percidae) 



Peripheral nervous system 

 559 Permanent sexual coloration 



Permeability (See also: Blood brain barrier and under Bio- 

 460 membranes) 

 583 Permian 



450 Pesticide content (See also: Insecticide resistance) 



73 1 Pet fish 



535 Pharyngeal teeth 

 533 Pharynx and esophagus 

 466 Pheromone glands 

 685 Pheromones 



Photographing and illustration 



Photomicrography 

 445 Photophores (See also: Sexually dimorphic photophore) 



Physical and mechanical properties (See also under 

 Biophysics of fishes) 



Physics and mechanics of bones 

 460 Physics and mechanics of muscles 

 742 Physiological solutions 



Physiological techniques (See also: Large specimen 

 742 techniques, Small specimen techniques) 

 521 Physoclistous 



Physostomous 



462 Pigment cells 



464 Pigment chemistry 



463 Pigments 



Pike (See: Esocidae) 



500 Pineal 



501 Pineal endocrinology 

 501 Pineal light sensitivity 



Pipefish (See: Syngnathidae) 

 492 Pit organs 



511 Pituitary blood supply 



Pituitary gland (See: Adenohypophysis, 



503 Neurohypophysis) 

 510 Pituitary ventral lobe 

 548 Placentalike organs 

 644 Plankton 



Platyhelminthes 

 585 Pleistocene 

 585 Pliocene 

 736 Poison collecting 



451 Poison content (See also under Poisonous fish) 

 Poisonous as food (See also under Feeding, especially 



679 Rejection as food) 



732 Poisonous blood 



731 Poisonous fish (See also: Venomous fish) 

 720 Poisonous gas pollutants 



