By James Hibberd
Updated August 11, 2014 at 08:50 PM EDT

Discovery’s annual chum-n-fun Shark Week programming stunt has reeled in slightly fewer viewers this year, yet delivered record-setting numbers in a couple key demographics.

Sunday’s opener hooked an average of 3.6 million viewers, down 10 percent from 2013. Specifically, Air Jaws: Fin of Fury at 8 p.m. had 3.3 million viewers, while 9 p.m.’s Shark of Darkness: Wrath of Submarine had 3.8 million viewers. Among a couple of key demos like 18-49 and 25-54, however, the shows represented record highs—marking the biggest ratings in the 27-year history of Shark Week, which is good enough for Discovery to take a victory lap.

Shark Week continues tonight with new specials Jaws Strikes Back and Monster Hammerhead at 9 and 10 p.m., respectively. Plus, late-night show Shark After Dark airs live through Thursday, with tonight’s guest actor Danny Trejo (Machete) and Fast N’ Loud’s Richard Rawlings. And in case you missed it, here’s how Discovery chose those titles.