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Northern Pike Year‐Class Strength and Spring Water Levels
Author(s) -
Johnson Fritz H.
Publication year - 1957
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(1956)86[285:npysas]2.0.co;2
Subject(s) - pike , esox , spring (device) , incubation , fishery , rank correlation , water level , abundance (ecology) , biology , environmental science , geography , mathematics , fish <actinopterygii> , statistics , cartography , biochemistry , engineering , mechanical engineering
Relationships between spring water levels and strength of year classes of northern pike (Esox lucius) produced in Ball Club Lake of north‐central Minnesota are considered for the 7 years between 1945 and 1952. The years are ranked according to water conditions, including height during spawning and fluctuation during egg incubation, and according to the strength of year classes produced as judged from their abundance in the darkhouse spearing catch. Comparison of these two rankings by a rank difference correlation shows a correlation of 0.61. It is concluded that a high spring water level during spawning and a small decline in the levels during egg incubation represent good conditions for the production of a strong northern pike year class.