scallop_3 - ~ SCIENCE Strand .processes that shape the...

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~ SCIENCE Strand .processes that shape the earth .processes of life .how living things interact with their environment .the nature of science Standards .understands the need for protection of the natural systems on Earth .describes patterns of structure and function in living things .understands the competitive, interdependent, cyclic nature of living things in the environment .understands that science, technology, and society are interwoven and interdependent SOCIAL STUDIES Strand .people, places, and environments (Geography) Standards .understands the world in spatial terms .understands the interactions of people and the physical environment IANGUAGE ARTS Strand .writing .listening, viewing, and speaking .language Standards .writes to communicate ideas and information effectively .uses listening strategies effectively .uses speaking strategies effectively .understands the power of language Aquacul1:ore can be defined as the raising of a(luatic organisms under controlled or semi-controlled conditions. It is similar to farming, only underwater! AmericaILs spend billions of dollars importing marine foods from around the world. We inlported 80 million pounds of Bay Scallops from China last year. These scallops were started from 26 bay scallops ori~inally taken from the UIlited States and r,used using our aquaculture techniques! .rust over thirty years ago we could go rig]u out to Tampa Bay and collect them ourselves. Now we pay to import them from China! How did this happen? Scallops are catastrophic spawners, that is, wherl one scallop spawns they all follow and you have one massive spawning. T1is occurs because fertilization occurs in the water column, In order for eggs and sperm to meet they have to be present at the same time. Howev ~r, if conditions are not ideal when ttle first scallop spawns and triggers spa,vning in the rest of the population, 1:he results may be disastrous. The majc,r factor determining the occurrence (If the spawning event seems to be a change in temperature. Unfortunately, even though the temperature may be correct, something else may be wrong. For instance, the tide may be going out, not in. The entire spawn from that population may be lost. However, th«~re are usually other 16
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D RO JECT ~ceano gr ap hy 700 eggs/cJn3. A mjxture of antibiotics may then b,~ added. However, this brings with it the ]Jroblem of tissue residues, toxic effect:) on the larvae and possibly bacterial re sistance. Other avenues of pathogen a'10idance such as water treatment and probiotics are being studied at lJSF. The water is replaced every two days. When the larvae reach the veliger stage they are sieved
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This note was uploaded on 07/31/2011 for the course OCB 6050 taught by Professor Staff during the Spring '11 term at University of South Florida - Tampa.

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scallop_3 - ~ SCIENCE Strand .processes that shape the...

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