Title: Annual report of the Commissioner of Fisheries to the Secretary of Commerce for the fiscal year ended ..
Identifier: annualreportofco2223unit (find matches)
Year: 1923 (1920s)
Authors: United States. Bureau of Fisheries
Subjects: Fisheries
Publisher: Washington : G. P. O.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
GOLDFISH. feeding the granules are steeped in lukewarm water, or they may be forced through a colander or other device to produce a vermicellilike form. It is the opinion of a good authority on goldfish that this food contains too much animal substance to produce entirely satisfactory results. Prepared foods containing many of the ingredients mentioned are for sale in the market and their use can be recommended to the ama- teur aquarist. The main thing to guard against is the giving of more than the fish will consume at one feeding, as any excess allowed to remain in the water will eventually pollute it and produce diseased conditions. Daphnia, popularly known as "ditch fleas," are an excellent live food for goldfish. The same may be said with reference to the larv^ of the mosquito, which can be had in large quantities during the sum- mer months and may be found in rain barrels or stagnant pools, the common name being "^vrigglers." DISEASES AND THEIR TREATMENT. Illness among goldfish becomes apparent in many ways, but as a usual thing the fins are blood- shot, the dorsal fin droops, and the affected fish is inclined to rest on the floor of the aquarium, with little or no desire for food. Where only one fish is diseased the cause may be attributed to overfeeding or con- stipation, but if a number are ill it is an indication that something is radically wrong, either with the food, the water, the oxygen supply, or the temperature conditions. The excrement in health is dark, cither a brownish green or black. If white or yellow it indicates over- feeding. When a fish becomes dis- eased, it should be immediately re- moved from the aquarium. Goldfish must be handled gently and as little as possible, to avoid injury to their scales, fins, or tails. The dip net used for their transfer to and from the aquarium should be round and somewhat deep, rather than funnel-shaped. If it can be avoided, fish should never be grasped by the hands. Sudden changes in temperature produce the diseases known as white fungus" and "tail rot." When a whitish coating or split- ting of the fins is noted the affected fish should be placed m another
Text Appearing After Image:
Fig. 6.—L,iid'^\igia, (Liidicigia glandulosa). Nat- ural size. 1 'rizedfor it.s beauty in the aquarium; grows from cuttings.

Note About Images