21. Feeding Behaviors of Gray Whales Skim Feeding on Crab Larvae Mysid Feeding-notice left fluke is in the air so the whale is on its right side above bottom. Each feeding behavior is unique for the type of prey the gray whale is targeting. Feeding on mysids in a Bullwhip Kelp bed-looks like a shark fin.
22. Mysid Swarms Seen on Fish Finders ( Red Band above the Black Bottom) Swarm 8 foot thick and continuous Sharking- indicative of mysid feeding seen in areas with thick echogram traces of mysids and shallow waters 20-35 feet deep
23.
24. What is in Whale Fecal Material? What is in Whale Fecal Material? Mysid with Telson Statocyst Neomysis telson to Left Holmesimysis to right
29. How do you sample population dynamics information of mysids? Put down plankton net Put down underwater camera Determine density with acrylic cube Use of an acoustic sensor
30. Determining Density and Nearest Neighbor Distances (NND) Mysids NND can be from ½ body length to 2 body lengths Acrylic Cube
32. What Do We Know About the Life History of Mysids? Female Holmesimysis with brood pouch of 32 eggs-Stage 1 Mysids undergo 3 stages while in the brood pouch. To the right is: Stage 1-the Egg Stage
33. Mysid Larval Stages, Stage 2 and Stage 3 Female with 19 Stage 2 larva or “ Torpedo stage ” Late Stage 2, eyes pigmented Stage 3 Molted Larva have eyes on stalks -also called the “Cookie Monster Stage”
34. Problems Facing Gray Whales Natural Problems 1. Changes in Prey Biomass ie. El Nino 2. Attacks by Orcas ie. 1/3 Calves killed each year Man-made Problems 1. Boat Hits 2. Entanglement in Fishing Gear 3. Shot or Harpooned 4. Noise Levels ie. Shell Offshore Inc., 190dB problem 5. Toxins ie. Stinky Whales
35. What Happens to Gray Whales in Years with Poor Mysid Biomass? 2005 was a poor year for mysids and 2006 was an excellent year for mysids 2006 2005
36. Model Comparing Years of Continual Upwelling and Sporadic Upwelling 2005 and 2010 - weak winds 2003, 2004, 2006, 2007, 2008, 2009 - strong winds
37.
38. Body Condition varies with changes in Biomass Depression in Profile Straight Profile Good Body Condition seen in 2006 Poor Body Condition seen in 2005
39. They can become undernourished due to lack of food supplies Whales are sensitive to changes in their environment as seen by the scapula protruding
40. Orca Attacks Transient Orcas kill seals, sea lions and whales Tooth rakes on tail fluke or neck
41. Orcas Attack Star Star’s fluke in 1999 Star’s fluke in 2006 Evidence of an orca attack with tooth rakes on ventral and dorsal flukes
47. They can get lesions over their body due to toxins in the water or a depressed immune system Gray Whales with Toxins
48. Identification of Individual Gray Whales by Dorsal Hump Region Eagle Eye was born in 1994 to Snake Eyes and is a male Rare Flukeage Poopage Eagle Eye
78. 20 (2.16 0 Mean Number of Juveniles/Female in August (n=75) 33 (1.59 0 Mean Number of Eggs/Female in August (n=67) 21 (1.29 19 (1.58) Mean Number of Juveniles/Female in May (n=85) 25 (4.32 22 (4.34) Mean Number of Eggs/Female in May (n=52) Mysids 0% 80% Percent of Whales in Poor Condition 90% 19% Percent of Time in Mysid Feeding 95% 20% Percent of Time of Whales in Residency 37 15 Number of Resident Whales 77 38 Days Observing 462 228 Observing Hours Resident Whales 2006 2005