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Low Temperature Effects on Minnows Phoxinus phoxinus and juvenile Atlantic Salmon Salmo salar Studies have shown that freshwater minnows and juvenile Atlantic Salmon become nocturnal with increased low temperature To determine if these species are nocturnal at low temperatures counts of individual fishes would be taken by how many fishes are observed during the daytime taking refuge underneath rocks Also by observing how many individuals are active at nighttime At a warmer day time temperature of 132 o C minnows were taking refuge only 20 of the time On the other hand at cooler daytime temperature of 66 o C minnows were found taking refuge 75 of the time Similar results were found for the juvenile salmon In both instances it is suggested that this behavior is an adaptation to avoid predators during daytime hours INTRODUCTION Phoxinus phoxinus commonly known as minnows are a group of freshwater fish that live in mid- to high-latitude streams and rivers Recently strange behavioral patterns of the minnows foraging strategies have been observed It has been seen that the minnows in low temperatures in the winter would seek refuge during the day but emerge to feed at night Greenwood Metcalfe 1998 This behavior has been well documented in the species Salmo salar the Atlantic Salmon Field observations by Francis Gries Juanes Parrish Whalen 1997 showed that juvenile salmon would emerge at night in low temperatures to feed This was found in post-young-of the year PYOY salmon only This study will look at both the minnow and the juvenile salmon to see if there is a correlation between the two species foraging habits METHODS The minnows to be studied were captured from the River Endrick in west Scotland in early November of 1995 The fish were caught using hand netting and were transferred to Glasgow University The minnows were placed into glass holding tanks Then tanks were prepared for the experiment Tanks measuring 60 long
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