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Chapter 9 Age and Growth Methods and State Averages Form
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People also ask
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What are the methods for determination of growth in fish?
Anatomical method: counting the regular growth marks formed in hard tissues such as scales, otoliths, vertebrae, spines and tail bones. Length-frequency analysis: monitoring the progression through time of the identifiable modes in size classes. -
How can you tell how old a carp is?
The calcified (or hard) structures of a fish record seasonal growth patterns in the form of annuli (or rings) which can be counted to determine the age of the fish. The most commonly used structures are scales, otoliths (ear bones) and hard fin rays. -
What is the scale method for fish age determination?
Scales. Scales are the most widely used aging structure in North America because of their non-lethal ease of collection. Counting the number of annuli (rings) on a scale provides the fish age and the spacing between rings is proportional to the growth of the fish. -
Is there a way scientists can tell the age of fish?
With the help of the microscope, scientists are able to see “growth zones,” deposited annually on the otolith. This tells them the age of the fish. The process is similar to determining the age of a tree. -
How can you tell how old a bluegill is?
However, the age of the fish is determined by counting the number of wide growth rings called annuli. In our example, the bluegill is 4 years old. Because the relationship is based on a ratio, the scale length and length to each annulus can be measured directly from the projected image. -
How do you determine the age and growth of a fish?
You can count the number of paired opaque and translucent rings, or annuli, to estimate the age of a fish, so a fish with two annuli would be two years old (see image below). The annuli are visible when magnified under a microscope at 6 to 40 times life-size. -
What is the direct method of age determination in fish?
Almost every skeletal structure has been used for age determination of fish. Of these otoliths and scales are the most widely used because they are easy to collect and store. The thin bones of the head and of the pectoral and pelvic girdles have also been used. -
How do you determine the age and longevity of a fish?
It is possible to determine the age of fishes with reasonable accuracy by reading the 'growth rings' (annuli) in hard parts (scale, otolith, opercular bone, vertebra and cross-section of dorsal or pectoral spine and fin rays).
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