rissos dolphins

In 1888 a Risso’s dolphin, uncommon in that area, appeared in the strait between New Zealand’s North and South Islands. He was named Pelorus Jack and would guide steamers through the dangerous French Pass. He led ships through the strait for 24 years, each ship taking twenty minutes, without a single shipwreck. He disappeared in 1912.


Monterey Day 2 (May 5, 2017)

Very cool 8-hour trip with Monterey Bay Whale Watch! 

Got to spend the day with Alisa Schulman-Janiger, Nancy Black and many other cool people. Before we even left the dock, a curious female sea otter approached the boat and hung out with us while we finished boarding. Shortly after reaching the open ocean, we were greeted by a small pod of Common Dolphin then quickly found that the feeding fiesta of Humpback Whales from the previous day was continuing into the morning. They remained in the same relative area near the beach.

A gale wind warning was issued in the marine forecast and we were in a race to search for animals (primarily Killer Whales) before the winds hit. We zig-zagged across the submarine canyon in the middle of the bay but no Orca were in the area. When we reached the north part of the bay, we encountered a few more Humpbacks, a small pod of Risso’s dolphin and some interesting jellies.

Shortly after the winds started coming in hard, creating large wind waves and swells. Humpback Whales in the distance were breaching and pec slapping- though I did not want to take out my camera in very bumpy (and wet) conditions. As the winds got stronger, visibility decreased more and more and the swells became larger and very close together. It was quite an adventure getting back into the harbor!

Taiji’s annual drive fisheries, which normally commence at the beginning of September to early March, has just added two new species of cetaceans to capture for captivity or slaughter. Rough-toothed dolphins and melon-headed whales have been added to the list of now nine species that are subject to the hunts. The other animals include striped dolphins, bottlenose dolphins, pacific white-sided dolphins, pantropical spotted dolphins, risso’s dolphins, short-finned pilot whales, and false killer whales.

These cruel drive hunts are depleting wild populations of cetaceans and subjugating more animals to the confinement of a tank. To help support an end to these practices, remember to spread the word to your friends and family about what is happening, sign petitions, write letters, and take the pledge to not buy a ticket to a dolphin show.

PC: Dolphin Project

All About Grampus Griseus

Risso’s Dolphins (Grampus Griseus) are the only dolphins in the genus Grampus; their name was derived from Niçard naturalist, Antoine Risso.

They are a relatively large dolphin species, with adult lengths averaging at around 10′ and some individuals can grow over to be 13′. They don’t look like a “typical” dolphin, as they have a blunt shaped head and don’t have a long, protruding beak. 

Risso’s dolphins can be highly active at the surface exhibiting a range of behaviours like breaching and spyhopping. They usually do not bow ride, but they can be seen travelling in the wake of ships. 

Younger Risso’s are usually darker in color and older individuals appear more white. When they are born, infants are dark grey on their sides and back, with cream colored areas on their bellies and around the beaks. In older calves, the nonwhite areas darken to nearly black, and then lighten (except for the always dark dorsal fin). 

As they grow older, white linear scars begin to cover their bodies. These are derived from scratches from squid (their primary prey) and from other Risso’s dolphins during social interaction; these scars eventually cover the bulk of the body, hence why older individuals appear whiter. 

Most individuals have two to seven pairs of teeth, all in the lower jaw. Rather than teeth in the upper jaw, there are “sockets” that fit each tooth on the lower jaw. This is a common characteristic for cetacean that feed heavily on squid (i.e. Sperm Whales). 

They are found worldwide, in temperate and some tropical waters. They typically reside in deep water, fairly close to land. Here in Southern California, we see them once or twice every few months. They are considered to be one of the 5 most commonly seen local dolphin species (the others are Long and Short beaked Common Dolphin, Bottlenose Dolphin and Pacific Whitesided Dolphin).

Photos/Footage by Mark Tyson and Craig DeWitt.

anonymous asked:

What do you think of Megatron as a Risso's Dolphin? I mean, I love him as an orca as much as the next dude, but when I remembered the beauty of those scarred-up mothertruckers, I went, "that's him!!"

YES!!!! a risso’s dolphin is so suiting for tfp megs!!

i think false killers whales r also fitting for tfp megs cuz lookit those TEETH

i like tfa megs as a killer whale mostly bc im biased, but also bc they’re the biggest dolphin species which kinda fits how HUGE the cons are in tfa


I didn’t get to see any orcas today, even though the other boat spotted a lone male that disappeared into the fog, but that’s okay. I got to see about 10 humpbacks throughout the day, culminating in an hour-long lunge-feeding session at the end of the day. We also saw pods of Risso’s and Pacific White-sided dolphins. It’s no wonder why Monterey is my favorite place to whale watch - I’ve never been disappointed. 😊

Today was the second of my three all-day whale watching tours with Monterey Bay Whale Watch! We saw sea otters and sea lions of course, a black footed albatross, a pod of bottlenose dolphins, a large group of Risso’s dolphins, and several Humpback Whales including two very energetic ones towards the end of the trip who put on quite a performance with lots of breaching, head slapping, and pectoral fin slaps.