Cyprinodontiformes vivíparos e ovovivíparos

Livebearer Cyprinodontiformes

Aquariofilia > Registos de temperatura da água do lago de jardim

Aquaristics > Garden fish pond water temperature logging

















Livebearer Cyprinodontiformes in the garden fish pond

Garden fish pond water temperature logging 2011 1st trimester ( from  January the 1st 2011 to March 31st 2011 )


Temperature it is probably the most studied environmental and ecological factor, as evidenced by the relevance of it in the scientific literature, mainly due to the direct effects it has on living organisms ( and in the physiology of cold-blooded animals in particular, like fish, as it reveals an prevailing importance as restrictive condition on life support and the chemical reactions related to it ).
As original methodology all through the first stage ( from January 1985 to December 1996 ), temperature readings were made with mercury-in-glass thermometer ( aquaria type ).
To standardize results as well as to correct any inaccuracy, ( particularly between 0ºC / 32ºF and 40ºC / 104ºF ), both thermometers readings were compared with a digital electronic thermometer.
These tests were taken for certifying and calibrate the temperatures measured as good as possible.
In both cases, the mercury-in-glass thermometers remain floating all the time and removal from water meant for examination, took only a few seconds, just the time required for data interpretation ( temperature reading ).
Data collections happened usually between 8:00 and 9:00. On the odd occasion, some readings have been done between 18:00 and 19:00, depending on convenience or weather conditions. Nevertheless, an overwhelming preponderance of the readings had taken place at morning period. Only a few had taken place at the end of the day ( from 18:00 to 19:00 ).
From January 1999 to December 2006, the mercury-in-glass thermometer was replaced by a digital electronic one - Hanna Instruments HI 8424 ( pH, mV, ºC ).
Again the performance of this new equipment was compared with the same standard digital equipment used for similar operation with the preceding two mercury-in-glass thermometers on service before it.
At a later stage, from January 2011 until the present, now used automatic recording data logger EL-USB-1 ( ), which can acquire data ( temperature readings ) every 60 minutes. Initially tests that were conducted in December 2010, the time span of the readings was every 5 minutes or every 30 minutes, yet the evidence showed no significant changes that could make such choices significant.
The recording surface data loggers are submerged at 15 cm depth in the fish pond water. For the air temperature the data logger is located in accordance with the parameters set by the World Meteorological Organization ( WMO ). This new methodology has revealed interesting conclusions and allows a more rigorous assessment and more factual environmental conditions, as evidenced by the comparative graph in figure 1 ( for ºC ) and figure 2 ( for ºF ).
Comparing the old system outcome ( in which temperatures were recorded only once every 24 hours ) and the current system ( in which temperatures are recorded every hour ), we can easily asseverate that real daily variations and the effective temperature range, were in fact unknown.
With the perception of the yellow areas signaled in the graphic, we can become aware of the information that would have been lost between March 20th 2011 and March 31st, 2011 if using the old system.
According with the information collected through the same temperature range, during these 11 days, the conclusions would have been only 2°C / 3,6ºF thermal amplitude ( between 15ºC / 59ºF and 17ºC / 62,6ºF ), when in fact the amplitude recorded by the current system has allowed us to realize that actually it was 8°C / 14,4ºF ( between 15ºC / 59ºF and 23ºC / 73,4ºF ).
The rigor in the information available often makes the difference between the success and failure on the acclimatization of a non native species. It also means that a reliable data can also help us to avoid causing unnecessary suffering to living beings by subjecting them to inappropriate temperatures.
The data now acquired will allow new and more accurate statistics as, for instance, the number of hours that temperature recorded between certain limits was dated.

Figure 1 - Results contrast between the two systems ( red for the earliest or traditional one and dark blue for the current one ). The area in yellow represents the information gained from the implementation of the current system.

Figure 2 - Results contrast between the two systems. The area in yellow represents the information gained from the implementation of the current system.

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