Premium
Field Experiments in Selecting the Most Efficient Tag for use in Haddock Studies
Author(s) -
Rounsefell George A.
Publication year - 1942
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(1941)71[228:feistm]2.0.co;2
Subject(s) - haddock , bachelor , fish <actinopterygii> , fishery , visibility , value (mathematics) , biology , geography , statistics , mathematics , archaeology , meteorology
Field experiments made along the coast of Maine including 2,073 tagged haddock and 15.5 per cent recaptures have demonstrated that haddock caught by hook and line can be tagged successfully in water as deep as 30 fathoms. Three types of tags were tested: The modified Petersen disc, the bachelor button, and the internal anchor. The disc tag gave the highest initial returns, but the later recoveries were poorer. The bachelor‐button tag appears to be the most efficient because of the value of the more protracted returns in estimating the rate of mortality, but it has certain mechanical defects to be corrected. The internal anchor tag gave the poorest returns owing to the early loss of the outside dangler which greatly reduced its visibility. This tag holds promise if redesigned as it appears to remain with the fish as long or longer than the button type. Returns are shown by size of fish and a break‐down of time at liberty is given for each type of tag.