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Our Trout Egg Incubation Project
Click the photos to see them much larger or click the camera to see our daily photos |
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Day |
Date 2003 |
Water Temp. (degrees F) |
(click to learn) |
Running Total T.U.'s |
Mortality of Eggs (E) Alevin (A) or Fry (F) |
Comments |
Photos (Click the camera to see them) |
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Thurs |
2/13 |
44 |
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450 |
Our 200 rainbow trout eggs arrived today! |
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Fri. |
2/14 |
44 |
12 |
462 |
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We are watching 7 eggs which have white spots on them to see if they are going to die. |
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Sat. |
2/15 |
46 |
14 |
476 |
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Sun. |
2/16 |
45 |
13 |
489 |
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Mon. |
2/17 |
45 |
13 |
502 |
9 E |
The one which appeared to hatch was dead today. |
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Tues. |
2/18 |
44 |
12 |
514 |
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2 have hatched. 1 looks dead. We are watching 7 to see if they will live. |
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| Wed. | 2/19 | 44 | 12 | 526 |
3E 1F |
There are 187 eggs left. | |
| Thurs. | 2/20 | 43 | 11 | 537 | |||
| Fri. | 2/21 | 47 | 15 | 552 | 1E | There are 5 hatched alevins. We do not know why the temperature in our tank went up so much today. |  |
| Sat. | 2/22 | 46 | 14 | 566 | There are 9 alevins hatched now. | |
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| Sun. | 2/23 | 47 | 15 | 581 | 2E |
There are now 17 alevins hatched. We have 184 eggs left. |
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| Mon. | 2/24 | 47 | 15 | 596 | 50 alevins have hatched. | |
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| Tues | 2/25 | 46 | 14 | 610 | 2A 3E |
21 eggs have died in all. By the end of the day, about 3/4 of the eggs had hatched! | |
| Wed. | 2/26 | 44 | 12 | 622 | The water is getting cloudy with all the eggs hatching. Hatching sometimes raises the pH level of the water so we will check it. | |
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| Thurs. | 2/27 | 44 | 12 | 634 |
1E 1A |
Nearly all the eggs have hatched. The bodies are getting longer and their eyes are very large. We put some of the eggs & alevins in the bottom of the tank. | |
| Fri. | 2/28 | 46 | 14 | 648 | Only 16 have not hatched. | |
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| Sat. | 3/1 | 46 | 14 | 662 | |||
| Sun. | 3/2 | 46 | 14 | 676 | 1E | ||
| Mon. | 3/3 | 45 | 13 | 689 |
2A 2E |
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| Tues. | 3/4 | 44 | 12 | 701 | We put the alevins in the gravel today. | |
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| Wed. | 3/5 | 45 | 13 | 714 | We are watching 5 alevins which seem deformed. The eggs have all hatched now. | ||
| Thurs. | 3/6 | 45 | 13 | 727 | Their heads are so big and so are their eyes. They are staying in the gravel in schools. Some are by themselves. They are starting to move around more. | ||
| Fri. | 3/7 | 44 | 12 | 739 | |
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| Sat. | 3/8 | 44 | 12 | 751 | |||
| Sun. | 3/9 | 44 | 12 | 763 | |||
| Mon. | 3/10 | 44 | 12 | 775 | 1A | The 5 we have been watching are still alive, even the ones students call the "siamese twins." | |
| Tues. | 3/11 | 44 | 12 | 787 | The alevin are getting more active at the bottom of the tank. Many of them are huddled together. | ||
| Wed. | 3/12 | 45 | 13 | 800 | 1A | ||
| Thurs. | 3/13 | 46 | 14 | 814 | 1A | The water quality is very poor. It is very cloudy. The alevins' bodies are getting darker and you can start to see the tail bones. You can see the dorsal fins developing. | |
| Fri. | 3/14 | 44 | 12 | 826 | |
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| Sat. | 3/15 | 44 | 12 | 838 | |||
| Sun. | 3/16 | 44 | 12 | 850 | |||
| Mon. | 3/17 | 44 | 12 | 862 | |
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| Tues. | 3/18 | 44 | 12 | 874 | Their bodies are developing. | ||
| Wed. | 3/19 | 44 | 13 | 886 | The siamese twins are still alive. pH is 7.4, dissolved oxygen is 10 ppm. | |
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| Thurs. | 3/20 | 45 | 13 | 897 | We replaced 3 gallons of water because the water was cloudy. pH was 7.5 afterwards. | ||
| Fri. | 3/21 | 45 | 13 | 909 | |||
| Sat. | 3/22 | 45* | 13 | 922 | During this time, we are on spring vacation, so the * means this is an estimate. | ||
| Sun. | 3/23 | 45* | 13 | 935 | |||
| Mon. | 3/24 | 45* | 13 | 948 | |||
| Tues. | 3/25 | 45* | 13 | 961 | |||
| Wed. | 3/26 | 45* | 13 | 974 | |||
| Thurs. | 3/27 | 45* | 13 | 987 | |||
| Fri. | 3/28 | 45* | 13 | 1000 | |||
| Sat. | 3/29 | 45* | 13 | 1013 | |||
| Sun. | 3/30 | 45 | 13 | 1026 | 14F | They are really developing. | |
| Mon. | 3/31 | 45 | 13 | 1039 | 10F | |
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| Tues. | 4/1 | 44 | 12 | 1051 | |||
| Wed. | 4/2 | 43 | 11 | 1062 | |||
| Thurs. | 4/3 | 43 | 11 | 1073 | |||
| Fri. | 4/4 | 43 | 11 | 1084 | 7F | They are really swimming around a lot now. | |
| Sat. | 4/5 | 43 | 11 | 1095 | |||
| Sun. | 4/6 | 43 | 11 | 1106 | |||
| Mon. | 4/7 | 43 | 11 | 1117 | |||
| Tues. | 4/8 | 44 | 12 | 1129 | |||
| Wed. | 4/9 | 44 | 12 | 1141 | 4F | The fish are becoming very active and swimming all over. 66 fish have died in all. | |
| Thurs. | 4/10 | 45 | 13 | 1154 | |||
| Fri. | 4/11 | 44 | 12 | 1166 | 3F | Release Day! | |
| Date | Photos - click | Photos - click | Photos - click | Notes | ||
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Feb. 13 |
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Eggs arrived from the Oregon Department of Fish and Wildlife with 450 T.U.'s (Temperature Units) 200 trout eggs were delivered. Our fish aquarium was ready, the water was 44 degrees F and the pH was perfect (7.2). The eggs came protected in a wet thick paper towel. We put the eggs in a wooden frame with screen which floats so students can observe them daily. The little black dots inside the eggs are the trout's eyes. |
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Feb. 18 |
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Note the dying eggs on the photo to the immediate left. When the eggs turn white we remove them from the rest of the eggs because that means they are dead or dying. Look closely at the middle picture! You'll see a fish beginning to hatch! | ||
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Feb. 21 |
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The photo to the left shows the eyed-egg stage really well. |
There are now 5 hatched alveins. Try to find them in these pictures. The dark orange spots inside the eggs are getting bigger. | ||
Feb. 22 |
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There are now 9 alevins hatched. Look at these pictures! |
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Feb. 23 |
Great close up of fish with egg shell coming off. |
An egg shell is coming off. |
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There are now 17 alevins hatched. 8 more hatched today.
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The whiter egg in the lower right is dead. |
We are watching these eggs because they are different than the others. |
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Lots of alevins! |
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Feb. 24 |
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50 alevins have now hatched. | ||||
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Feb. 25 |
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About 3/4 of the eggs are now hatched into alevins. | ||||
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Feb. 26 |
These alevin appear to be sharing the same egg sac. |
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The foamy looking stuff and air bubbles is the result of the egg shells coming off. The water is getting cloudy with all the egg shells floating around and dissolving into the water. | ||
Feb. 27 |
We do not think the deformed alevins will live. |
The eggs & alveins at the bottom of the tank. |
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Nearly all the alevins have hatched now. Their eyes look very large in proportion to their heads. |
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Feb. 28 |
This alevin appears to be separating from his yolk sac. |
The alevins sharing one yolk sac are still alive. |
Most of the eggs have hatched now. |
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The heads of the alevins are getting larger.` |
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Mar. 3 |
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The
alevin are all hatched now. They seemed crowded in the small wooden
screen frame, so we let them swim to the bottom of the tank. They
wiggle and move, but mostly they are at rest in the gravel.
The deformed fish are still alive, much to our surprise. |
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Mar. 10 |
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Mar. 13 |
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Mar. 14 |
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Mar. 17 |
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Mar. 19 |
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Note that the deformed fish are still alive. | |
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Mar. 31 |
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Apr. 4 |
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The deformed fish (see Mar. 19 third photo from left) are still alive! | ||
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Apr. 9 |
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The fish are very actively swimming now around the tank. A total of 66 alvein & fry have died in all. |
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Apr. 11 |
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More Release Pictures |
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Question: What is a "Temperature Unit"?
One Temperature Unit (or T.U. as we refer to it) is one degree on the Farenheit temperature scale. The eggs earn one T.U. for every degree above freezing (32F) our water is. For example, if the water is 40 degrees, that is 8 degrees above freezing, so the eggs have accumulated 8 T.U.s or 40 - 32 = 8.
