Today is bluefish Saturday. Participating fishermen have an opportunity to win $500 if they catch the biggest fish today in a boat, and there is another $500 for the angler who catches the biggest bluefish from the shore.

At derby headquarters this morning, the bluefish were arriving and the talk was all about bluefish.

Janet Messineo, of Vineyard Haven, who continues to dominate the weigh-in with fish, had her busiest morning yet. At around 8:30 a.m. she came in with a 28-inch 4.81 pound bluefish.

“That is the thinnest bluefish I have ever seen,” she said, and left.

Half an hour later, she walked into the derby weigh station with a false albacore she had just hooked at Memorial Wharf. The fish weighed 8.35 pounds.

Derby officials love Ms. Messineo’s luck with fishing. She explained that she had worked hard the night before to get the bluefish. “I went out at 3 a.m. I caught the fish at 6 a.m.,” she said.

The albie at Memorial Wharf came easier. Ms. Messineo said she now has three species she has weighed in. If she can catch a bonito in the days ahead, she will be eligible to compete for the grand slam.

“Oh no. I am now in bonito prison,” Ms. Messineo said. “I haven’t caught a bonito in three years.”

Minutes later Jason Graves of Edgartown walked into the weigh station with a bluefish weighing 9.13 pounds he had caught earlier in the morning. “I was fishing with my boss,” Mr. Graves said. North Shore. The fish was caught at 1 a.m. from the shore. The two had fished all night.

They started at 9 p.m. and finished at 2:30 a.m. “We used everything — bait, eels,” he said.

Mr. Graves, 27, is the grandson of Robert L. Graves, 75 of Oak Bluffs and he is a good fisherman. The apple doesn’t fall too far from the tree.

Last night, Don Eber took the lead in the boat bluefish division with a 14.43-pound bluefish. Stay tuned.

Derby participation continues to grow. The number of registered fishermen number is up to 1,629. There are 117 junior fishermen registered, 221 seniors; 217 women and 1,408 men.