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Pathology in Redear Sunfish Exposed to Hydrothol 191
Author(s) -
Eller Lafayette L.
Publication year - 1969
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(1969)98[52:pirset]2.0.co;2
Subject(s) - lepomis , gill , biology , fish <actinopterygii> , teleostei , anatomy , zoology , andrology , fishery , medicine
Pathogenic effects of Hydrothol 191, mono‐N,N‐dimethylalkylamine salt of endothall (7‐oxabicyclo [2.2.1] heptane‐2–3‐dicarboxylic acid) on redear sunfish (Lepomis microlophus) were investigated in ponds at Tishomingo, Oklahoma. Morphologic and systemic tissue alterations occurred in gill, liver, testis, and blood. Marked fusion of adjacent filaments of gills was observed in the early stages of contact with 0.3 ppm Hydrothol; however, after 14 days fish adjusted to the pesticide and the trend of tissue alteration was reversed with a gradual return to basic gill structure. Fish from the 0.3 ppm Hydrothol ponds showed marked liver damage; the damage was receding by the 56th day and was comparable to livers of control fish by the 112th day. Small and large ova‐like hypertrophic cells appeared by the third day in the testes of fish from 0.03 ppm and 0.3 ppm Hydrothol‐treated ponds. These bizarre cells disappeared from the testes of 0.03 ppm‐exposed fish by the 14th day and from the testes of 0.3 ppm‐exposed fish by the 28th day. The hypertrophic cells of the testes remain unclassified and of unknown origin. Precipitated materials were observed in blood vessels of the posterior kidney at the 36th day in fish sampled from ponds treated with 0.5 ppm Hydrothol.