Blue - Do the Maths on By-catch and Overfishing

Blue - Do the Maths on By-catch and Overfishing

Lesson 2 of 4 in this unit

  • Secondary
  • Year 7 - 8
  • Mathematics
  • Environmental
  • Biodiversity
  • Conservation
  • Oceans
  • Water
  • ...

Lesson summary

This lesson incorporates clips from Blue The Film as learning inspiration. Students will understand the importance of conserving our oceans by exploring the real world problem of by-catch and overfishing. They will mathematically investigate the problem and use data to plot graphs showing how by-catch is influencing the number of marine animals in our oceans. Students will then investigate ways in which the problem can be reduced and fishing practices can be changed-

Learning intentions:

Students will...

  • plot data on by-catch and investigate what might happen if fishing practices changed.

Success criteria:

Students can...

  • plot linear relationships using a table of values with real data
  • use internet research to find relevant statistics
  • understand the problem with by-catch and how it can be reduced. 

Lesson guides and printables

Lesson Plan
Student Worksheet
Teacher Content Info

Lesson details

Curriculum mapping

Australian curriculum content descriptions:

Year 8 Mathematics: 

  • Plot linear relationships on the Cartesian plane with and without the use of digital technologies (ACMNA193).
  • Solve linear equations using algebraic and graphical techniques. Verify solutions by substitution (ACMNA194).

Syllabus outcomes: MA4-1WM, MA4-3WM, MA4-11NA

General capabilities: Critical and Creative ThinkingPersonal and Social CapabilityInformation and Communication Technology (ICT) Capability

Cross-curriculum priority: Sustainability OI.1, OI.6.

Relevant parts of Year 7 Mathematics achievement standards: Students represent transformations in the Cartesian plane. They interpret simple linear representations and model authentic information.

Unit of work: Blue The Film – Mathematics – Year 7 – 10. 

Time required: 80 mins +

Level of teacher scaffolding: Medium – Lead students in discussion.

Resources required

  • Student Worksheet – one copy per student
  • Device capable of presenting a clip to the class
  • Student access to laptops/desktop computers


This lesson is designed to build students’ competencies in the following skills:

  • Collaboration
  • Digital literacy
  • Problem solving
  • Social skills

Additional info

Blue is a feature documentary film charting the drastic decline in the health of our oceans. With more than half of all marine life lost and the expansion of the industrialization of the seas, the film sets out the challenges we are facing and the opportunities for positive change. Blue changes the way we think about our liquid world and inspires the audience to action. Find out how to screen or download the film here. Along with the film is an ambitious global campaign to create advocacy and behaviour change through the #oceanguardian movement. To become an ocean guardian, see the website.

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