Living the Life of a Trout!

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Presentation transcript:

Living the Life of a Trout! Tracking a Trout’s Life Cycle

What is a life cycle? Biological (& continuous) process that all organisms undergo Period of time where an organism is produced, grows, and becomes sexually mature and reproduces Consists of various defined stages in the growth and development of an organism

Every organism has a life cycle!

Trout Term used to describe a variety of freshwater fish Play an important role in the ecosystem Source of food and nutrition Trout common to NJ: Rainbow, Brook, & Brown Brown Bear w/ Salmon

Salvelinus fontinalis Brook Trout Salvelinus fontinalis

Trout Life Cycle Fry Alevin Fingerling Eggs Juvenile Mature Adult

Spawning Biological process used by a majority of fish and aquatic creatures to reproduce Requires sexually mature trout (~3 yrs old) to release eggs and sperm Egg and sperm are reproductive cells Also known as gametes

The REDD A female ready to mate will build a nest called a redd Uses fins to remove gravel & debris from the bottom of a lake or stream Usually a shady location Location where the eggs will begin to grow and development. The REDD

Stage 1: Eggs Female releases her eggs into the redd’ Male releases milt (sperm) to fertilize the eggs Afterwards, the female covers the eggs with gravel Female will move to a different location to create another redd and mate with another male In a hatchery, eggs are removed from the female to be fertilized

Egg Development Undergo process of ‘hardening’ Occurs within 1 hour after fertilization All pores on the egg are closed and sealed Makes eggs sticky After ~20 days, eye spots develop in the embryo

Eye Spot Developing Body Fertilized Egg

Alevins After the eggs hatch (approximately 2-3 weeks), trout are classified as alevins Remain attached to the yolk sac at their belly Yolk sac provides nutrition Continue living in the redd

November 1, 2013 Recently hatched trout!

November 25, 2013 Eventually, the alevins deplete their yolk sacs. At this point, they begin swimming to the surface of the tank to look for food. Once the yolk sacs are completely depleted, the fish are independent and move into the next stage of life.

Fry Trout are independent of the yolk sac and begin looking for food No more yolk sac: Actually look like fish! Yolk sac

November 27, 2013 The trout are released from the net and the Styrofoam is removed from the front. Only the trout independent of their yolk sacs swim throughout the tank (all others line the bottom).

December 9, 2013 All the fish congregated at the top of the tank are looking for food since they no longer have a yolk sac Digital Thermometer

Lookin’ like Brook trout!

April 28, 2014: Release day

Trout released into the stream bed

We made the paper!

Mature Trout Trout will move to the main current of the stream Feed primarily on insects For the next three years, the trout will continue to grow and develop until reaching sexual maturity Then the life cycle continues…