Chapter 45

Fish Diversity in Stardew Valley

Lesson Overview

Title: Stardew Science: Fishing for Genetic Variation
Subject: Science (Biology / Life Sciences)
Age Group(s): 14–18
Tags: Genetic Variation, Heredity, Statistics, Probability, Data Collection, Gamification, Stardew Valley

Description:
This lesson uses the fishing mechanic in the popular video game Stardew Valley as a model for scientific field sampling. Students will "go fishing" to collect data on a population of fish, then analyze that data to understand and explain core principles of genetic variation, trait distribution, and the influence of environmental factors.

Lesson Plan

📋 Find the full lesson plan on the companion GameClass lesson — link at the bottom of this page!

Lesson Content

I. Key Teaching Points

  • Point 1: Individuals within a species' population exhibit natural variation in their inherited traits.
  • Point 2: The distribution of traits in a large population can be quantified and often follows predictable statistical patterns, like a bell curve.
  • Point 3: Environmental factors can impact a population's health and may introduce non-genetic or inheritable variations.

II. Practical Examples

For Teaching Point 1:
The video shows the player catching a Chub that is exactly 14 inches long. This single fish is one data point. In the full lesson, as students catch multiple Chubs, they will find that they come in various sizes (e.g., 12 in, 15 in, 17 in). This directly demonstrates natural variation in the "size" trait within the Chub population.

For Teaching Point 2:
While the video provides only one fish, the lesson requires students to fish for an extended period (e.g., 20 minutes) and record the species and size of every fish caught. By pooling this data as a class and creating a histogram of fish lengths, students will visually represent the distribution of this trait. They can then calculate the mean, median, and mode of fish sizes and discuss why most fish cluster around an average size while very small or very large ones are rarer.

For Teaching Point 3:
In the video, the player catches "Broken Glasses" and "Green Algae" while trying to catch fish. These "trash" items serve as a perfect analogy for negative environmental factors. The teacher can use this moment to prompt discussion: "What do the broken glasses represent in a real ecosystem? How might pollution affect the fish population's health, survival, or even lead to mutations?" This connects the gameplay event directly to HS-LS3-2 regarding environmental impacts on populations.

End of Lesson