. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 452 PARENTAL CARE AMONG FRESH-WATER FISHES. the best evidence as to the ovigeroiis period has been furnished by the Netunia hai'hvs or commersonii^ a species very abundant in south- ern Brazil, Avhere it is known as the bagre. H. von Ihering (1889) tells that in the Rio Grande do Sul the spawning season is the late spring and summer—that is, during November, December, and Jan- nary, The eggs of this species, by the way, have been declared t
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 452 PARENTAL CARE AMONG FRESH-WATER FISHES. the best evidence as to the ovigeroiis period has been furnished by the Netunia hai'hvs or commersonii^ a species very abundant in south- ern Brazil, Avhere it is known as the bagre. H. von Ihering (1889) tells that in the Rio Grande do Sul the spawning season is the late spring and summer—that is, during November, December, and Jan- nary, The eggs of this species, by the way, have been declared to be the largest of any known Teleost, being about three-fourths of an inch (17 or 18 millimeters) in diameter. But, although most of the Tachisurines are probably oral egg car- riers, all are not so, one making a peculiar kind of nest and another being declared to be viviparous. A FRESH-WATER TACHISITRINE. The northern Australian fish generally known as Arius australis, but which some modern systematists would call Hexanematichthys australis^ is a nest maker, but makes a nest different from those prepared by the glanis and the Ameri- can catfishes. The species is an in- habitant of the Hunter River, Richmond Riv- er, and the Boyne, and it was in the last that Semon found it in abundance and first noticed its nesting hab- its. By the English colonists it is called jewfish, and by the native blacks bolla. Inasmuch as jewfish is better known in con- nection with several other fishes, bolla may be a d V a n t a g e o usly used. The fish has the general appear- ¥\G.^.—The hoWa. {). AtterGiinther. nr\na o-p flio f-i 111 i 1 iov sea catfishes and slender fresh-water catfishes of America, but the upper surface of the head or casque from the interorbital region backward is thickly sprinkled with fine bead-like Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - color
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