. A first book of zoology [microform]. Zoology; Zoologie. THE BROOK TROUT «7 brano into the blood, and replaces carbon dioxide which passes out from the blood. Hence the process of breathing in a fish is eflFected by keeping the jfills continually bathed in water containing oxygen. During inspiration the mouth is opened, the branchiostegal membranes close the gill- openings, the operculum on each side moves outwards, and so water rushes into the enlarged mouth-cavity. During expiration the mouth is closed, each operculum moves inwards, and, as the throat is also closed, the. vewel taking impur
. A first book of zoology [microform]. Zoology; Zoologie. THE BROOK TROUT «7 brano into the blood, and replaces carbon dioxide which passes out from the blood. Hence the process of breathing in a fish is eflFected by keeping the jfills continually bathed in water containing oxygen. During inspiration the mouth is opened, the branchiostegal membranes close the gill- openings, the operculum on each side moves outwards, and so water rushes into the enlarged mouth-cavity. During expiration the mouth is closed, each operculum moves inwards, and, as the throat is also closed, the. vewel taking impure blood to gilt WMfi taking pure bU)od from glU bonv gtU giU raker gtll fUamenU qill hUxmenu CILL fuetlont CILL (side vUwl Fig. 51.—Side view and secti.»n of a Trout's gill. water passes out by the gill-openings. If we were to put a trout into water which has been boiled (so as to get rid of the dissolved oxygen) the poor animal would be unable to breathe, and would quickly die; in other words, a fish continually requires oxygenated water, otherwise suffoca- tion ensues. When fishes are seen to respire very quickly, it is a sign that they require fresh water; those who keep goldfish in little aquaria should be most careful either to have green plants living in the water or else to change. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Burlend, T. H; Cornish, George A. (George Augustus), 1872-1960. Toronto : Macmillan
Size: 1522px × 1642px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1915
