Investigation of the Behavior of Blowfly Larvae

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Investigation of the Behavior of Blowfly Larvae

By | October 2006
Page 1 of 7
Introduction

The blowfly goes through a complete metabolic change in body form at each stage in their life.

-Stage 1 - Egg
-Stage 2 - Larvae
-Stage 3 - Pupa
-Stage 4 - Adult

Adult -- Blowflies are a group ranging from 6 to 14 mm in length. The black Blowfly has a dark, olive-green body, black legs, and orange pubescence around the spiracles. All Blowflies have blunt mouthparts and do not bite. Egg -- The white or pale yellow eggs of Blowflies may occur in small batches or large masses. Individual eggs are about 1.5 mm long. Larvae -- These white to yellowish maggots have pointed heads. They develop through three instars and become 12 to 18 mm long when fully grown. Pupa -- Blowfly pupa are encased in light brown to black puparia (the tough, hardened skins). Each puparium is 9 to 10 mm long and 3 to 4 mm wide. In my investigation I will be only working with larvae (Stage 2 in the cycle). The larvae is the main feeding stage of the fly. There are 3 inistars. On hatching, first-instar larvae are roughly 2 mm long, growing to about 5 mm before shedding their skin. The second instar larvae grow to around 10 mm before they shed their skins to become third-instar larvae. Third-instar larvae grow to between 15 mm and 20 mm.

Hypothesis for Experiment 1

My hypothesis is I need to investigate the behavior of Blowfly Larvae in different light conditions. In this experiment I will be seeing how the larvae react to a direct light source from above.

The Equipment that was used in Experiment 1

-10 Blowfly larvae
-Simple choice chamber
-See-through lid for choice chamber
-A circle with a pencil line down the middle
-Stopwatch
-A lamp

What Happened in Experiment 1

My partner and I first got all the equipment above setup and ready on a workbench. I then got a glass beaker with the 10 larvae located inside it. We then both checked that there where exactly 10 larvae inside the beaker. My partner then carefully placed the 10...