Illustrator, Adobe's powerful vector graphics editor, offers an array of tools that make it a fantastic choice for creating digital art, including fish illustrations. If you're eager to learn how to make a fish in Illustrator, you're in the right place. This comprehensive guide will walk you through the steps, ensuring your fish illustration is as engaging as a school of rainbow trout in a vibrant stream.

Before we dive in, it's essential to remember that Illustrator uses a vector-based system. This means your fish will scale flawlessly, whether it's a tiny drawn in a postage stamp or a giant on a billboard. With this in mind, let's create a simple but stunning fish illustration together.

Setting Up the Document and Basic Shapes
First, open Adobe Illustrator and create a new document. For our example, let's use a document that's 800px wide and 600px tall, with an RGB color mode.

Now, let's start with the basic shapes. We'll need an ellipse for the body and a circle for the eye. To draw an ellipse, use theEllipse Tool (L). Hold Shift to keep the ellipse proportional, then drag it to create the body of your fish.
Shaping the Fish's Body

Next, we need to create the pointy end of the fish. Grab the Pen Tool (P) and click at the point where you want the tail to begin. Then, click again to add another point. With both points selected, pull the handles to create the desired tail shape. Use the Direct Selection Tool (A) to adjust the points precisely.
Now, our fish needs some definition. Select the body, then go to the Pathfinder panel (Window > Pathfinder) and click on the Divide button. This will separate the body into different parts, allowing you to apply anchovies behind with the support of shadows.", "Why Do Fish need Shadows?" href="#">Learn more.
Scaling and Inverting for a Realistic Look

To give our fish a more lifelike appearance, let's add some shading. Duplicate the fish body, then scale it down slightly. Invert the color by pressing Ctrl/Cmd + I, and place it behind your original body. Use the Transparency panel (Window > Transparency) to adjust the opacity, creating a subtle shadow that suggests thickness.
In addition to the main body, we can add a few scales for more detail. Draw small ellipses, apply a radial gradient to each, and position them appropriately. Remember, when it comes to fish illustrations, the details make the character.
Bringing the Fish to Life with Color and Bubbles

Now that we have the basic shape, it's time to add color and life to our fish. Let's make it a vibrant koi with orange, white, and black hues.
For the koi's distinctive Japanese-inspired patterns, use the Paintbrush Tool (B) to create wavy lines and shapes. Apply a linear gradient to these lines, using colors that complement your fish's base color. This will bring dimension and character to your illustration.









Creating Bubbles
What's a fish without bubbles? To add bubbles around our creature, use the Ellipse Tool (L) to draw small circular or oval shapes. Give these shapes a gradient fill, with white at 0% opacity on one end and full opacity on the other. Scatter these bubbles around your fish, ensuring they're not too regular or symmetrical; chaos is the key to a natural, underwater look.
To create a sense of depth and motion, vary the size and opacity of your bubbles. Some can overlap, and some can be semi-transparent, casting a reflection on the surrounding bubbles and contributing to the overall watery effect.
Adding the Finishing Touches
Our fish needs a final touch of perfection. Use the Paintbrush Tool (B) to draw delicate feathers for the tail, adding a touch of elegance. Then, add subtle highlights and shadows to the eye, making it shine and sparkle.
Finally, group all the elements (fish body, eye, scales, bubbles, etc.) together by selecting them and pressing Ctrl/Cmd + G. This will ensure your fish stays together if you move or rescale the illustration.
And there you have it! Your stunning, eye-catching fish illustration is complete. Now, experiment with different shapes, colors, and gradients to create an entire school of unique, captivating fish. Happy illustrating!