User:Mpolit4/Mummichog

Physiology
''This fish is well known for its ability to withstand a variety of environmental conditions. They can survive temperatures between 6 and(-); even within the same tidal cycle they can tolerate rapid temperature changes from 15 to(-).  'They are able to survive this vast temperature range by altering their metabolic rates at high and low temperatures. This is partly achieved by varying the isoenzyme of the lactate dehydrogenase (Ldh-B) enzyme expressed in warm or cold waters. These two versions of the enzyme allow for faster catalytic function and metabolism depending on if the fish is in northern, colder waters or southern, warmer waters. Based on genetic studies, the enzymes serum esterase (SERE) and malate dehydrogenase (MDH) also appear to play an important role in mummichog temperature control.' They are among fish species most tolerant of salinity changes (euryhaline). Mummichog larvae can grow in salinities ranging from 0.4 to 100 parts per thousand, the latter being about three times the normal salinity of seawater.''