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Growth, Habits, and Fecundity of the Ciscoes of Irondequoit Bay, New York
Author(s) -
Stone Udell Bennett
Publication year - 1938
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1937)67[234:ghafot]2.0.co;2
Subject(s) - fecundity , bay , biology , fish <actinopterygii> , predation , zoology , ecology , demography , fishery , geography , population , archaeology , sociology
This paper presents a study of ciscoes of Irondequoit Bay, New York, and deals with their migration, age and time of spawning, associated species at the time of spawning, predators, and conservation. This study is based on the age determinations of 505 specimens, on the calculations of the length at the end of various years of life of 500 of these ciscoes, and on the examination of the ovaries of 104 fish. The ciscoes of Irondequoit Bay belong to two related forms, but further study will be needed before their taxonomic status may be established satisfactorily. Calculated lengths were usually lower than actual lengths at capture of fish of the same age. The curve of growth in length is typical for the species and is the same for both males and females. However, the females generally run heavier than the males at corresponding lengths. Fecundity was estimated by the volumetric method. It was determined by actual counts that this method involved an error of 5.1 per cent. Fecundity increased with age, fish in age group VIII producing three to four times as many eggs as the group II individuals. Although there appears to be a great deal of variation in the fecundity at a particular age, the tendency is toward an increase with an increase in length and weight.