What’s a bivalve mollusk?

Bivalve mollusks (e.g., clams, oysters, mussels, scallops)

A roughfile clam from the Flower Backyard Financial institution Nationwide Marine Sanctuary—simply considered one of many various bivalve mollusk species.


Like fish, bivalve mollusks breathe by way of their gills. As filter feeders, bivalves collect meals by way of their gills. Some bivalves have a pointed, retractable “foot” that protrudes from the shell and digs into the encircling sediment, successfully enabling the creature to maneuver or burrow.

Bivalves even make their very own shells. An inside organ known as the mantle secretes calcium carbonate in order that because the inside invertebrate grows, the outer shell supplies a roomier house.

Many bivalve species play vital roles in aquatic and marine ecosystems by filtering the water and serving as habitat and prey for quite a lot of sea life. This various group of species, estimated at about 9,200, inhabits just about the complete world ocean, from the balmy tropics to the sub-zero Arctic, and from the deep ocean to sandy and rocky shorelines. Just a few have even taken up residence round hydrothermal vents discovered deep within the Pacific Ocean, under 13,000 toes.

If the bivalve’s organic brilliance alone fails to impress, then contemplate that NOAA estimated the 2011 financial worth of economic bivalve mollusk harvesting at about $1 billion yearly within the U.S., and the burden of the harvest was estimated at 153.6 million kilos.

What’s seaspeak?

NOAA Corps Ensign Diane Perry on the NOAA Ship Thomas Jefferson

Whether or not on the excessive seas or at port, misunderstood communication can result in critical and even harmful conditions. “Seaspeak”, the official language of the seas, helps to stop miscommunication.


Have you ever ever puzzled how crews on ships at sea talk? These days, crews include women and men from all around the world, and sometimes, a single ship’s crew comes from quite a lot of completely different nations. However that was not at all times the case. Again within the Nineteen Sixties, america and the UK dominated ocean site visitors, and 80 % of ships’ crews had been native English audio system. By the top of Seventies, nonetheless, the state of affairs had reversed, and as we speak, 80 % of ship’s crews don’t converse English as a primary language.

So what occurs when a ship captain wants to speak together with his or her crew, to a different ship, or to shore? Whether or not on the excessive seas or at port, misunderstood communication can result in critical and even harmful conditions.

To keep away from such confusion, in 1983 a gaggle of linguists and transport specialists created a brand new system of communication referred to as Seaspeak. English was chosen because the precept lexicon for Seaspeak as a result of it was the most typical language spoken on ships at the moment, and, importantly, it was additionally the language of civil aviation. In 1988, the Worldwide Maritime Group made Seaspeak the official language of the seas.

Seaspeak defines the principles of how you can speak on a ship’s radio. The variety of phrases is proscribed to make sure that messages and conversations are quick and clear. Eight phrases, referred to as message markers, precede every sentence. These phrases are Recommendation, Reply, Info, Instruction, Intention, Query, Request, and Warning.

An vital rule of Seaspeak is that numbers made up of two or extra digits are spoken in single digits. For instance, the quantity 33 is spoken as “three three” and the time 9:33 a.m. is spoken as “zero 9 three three.” Coordinated Common Time—the first time customary or worldwide time scale by which the world regulates clocks and time—is at all times used at sea.