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Data Set #023

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About the Data

ABOUT RAINBOW TROUT BIOMETRIC DATA

Rainbow trout taken from 4 different localities along the Spokane River (eastern Washington) during July, August and October of 1999 were analyzed for heavy metals for the Washington State Department of Ecology. As part of this study, the length (in millimeters) and weight (in grams) of each trout were measured; age determinations using scales are currently underway.

Rainbow trout show an exponential relationship between length and weight. Smaller (younger) fish are relatively long and skinny, whereas larger (older) fish are much more stout. This type of growth sequence is very common among many plants and animals; humans show the same kind of growth behavior.

The good fit of an exponential model to the data could be utilized to eliminate weighing the fish; just measure the length, and calculate the weight from the function.

Reference: Johnson, A. (2000), Results from Analyzing Metals in 1999 Spokane River Fish and Crayfish Samples; Washington State Dept. of Ecology report.

Web Site: http://www.ecy.wa.gov/biblio/0003017.html

     
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Rainbow trout from the Spokane River, WA (n = 42)

Source: WA State Dept. of Ecology report

length (mm)

weight (g)

457

855

405

715

455

975

460

895

335

472

365

540

390

660

368

581

385

609

360

557

346

433

438

840

392

623

324

387

360

479

413

754

276

235

387

538

345

438

395

584

326

353

270

209

359

476

347

432

259

202

247

184

280

248

265

223

309

392

338

460

334

406

332

383

324

353

337

363

343

390

318

340

305

303

335

410

317

335

351

506

368

605

502

1300

 

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