BlueOceanEyez
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Joined: Mar 07, 2008
Posts: 1635
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 Posted: Sun Aug 17, 2008 11:23 pm Post subject: Salinity |
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SeaView Salinity - High Resolution
About:
Seaview™ Salinity - High resolution ocean salinity analyses. Not a static graphic, but an interactive data layer like the SST
Salinity Fish Facts:
Salinity is the measurement of dissolved salt in sea water.
Most aquatic organisms require oxygen in specified concentration ranges for respiration and efficient metabolism, and DO concentration (Dissolved Oxygen solubility is dependent on salinity & temp) changes above or below this range can have adverse physiological effects. DO decreases as salinity increases. Even short-lived events can cause major "kills" of aquatic organisms. Exposure to low oxygen concentrations can have an immune suppression effect on fish which can elevate their susceptibility to diseases for several years. - ozcoasts.org
Evaporation of the ocean removes fresh water & thus increases the salinity of the ocean. Rainfall & emptying rivers add fresh water & thus decreases the salinity of the ocean.
Salinity also affects buoyancy of sea water. High salinity = easier to float. Low salinity = easier to sink. Think about plankton here.
Different species of fish live in / tolerate varying levels of salinity. Fish that are regularly in the lower salinity areas typically migrate away from the high salinity water and stay within the lower salinity water. Some species of fish tolerate all salinities, low, mid, and high. Needlefish & sheepshead are mid-level fish. Pinfish, leather jackets, spots, & sea trout prefer mid-high levels. Lizard fish prefer high salinity only.
Enough with the bait fish preferences. Let's talk about the big fish. White Marlin are adapted to high salinity & lower oxygen, their preference is around 35ppt salinity according to NOAA. Yellowfin Tuna prefer higher oxygen (lower salinity). Bluefin Tuna survive in 30 to 38ppt. Blue Marlin = 30s ppt. Cobia prefer >25ppt.
Blue water = higher salinity. |
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