Testing Status of Agents at NTP
(Chlorpyrifos)
CAS NO. 2921-88-2
Table 15b. Acute 96-hour LC50 Data for Chlorpyrifos in Aquatic Organisms
| Fresh Water Vertebrates | ||
| Cutthroat trout (Salmo clarkil) | 18 | USEPA, 1986 |
| Rainbow Trout (Salmo gairdner) | 7.1-51.0 | USEPA, 1986; USDI, 1988 |
| Lake trout (Salvelinus namaycush) | 98 | USEPA, 1986; USDI, 1988 |
| Goldfish (Carassius auratus) | >806 | USEPA, 1986 |
| Fathead Minnow (Pimephales promelas) | 170-542 | USEPA, 1986 |
| Channel catfish (Ictalurus punctatus) | 280-806 | USEPA, 1986; USDI, 1988 |
| Bluegill (Lepomis marochirus) | 1.1-10 | USEPA, 1986; USDI, 1988 |
| Inland silverside (Menidia beryllina) | 4.2 | USDI, 1988 |
| Salt Water Fish | ||
| Sheepshead minnow (Cyprinodon variegatus) | 136-270 | USEPA, 1986; USDI, 1988 |
| Mummichog (Fundulus heterociltus) | 4.65 | USEPA, 1986 |
| Longnose killifish (Fundulus similis) | 4.1 | Schimmel et al., 1983 |
| California grunion(Leuresthes tenius) | 1.0-5.5 | USEPA, 1986; USDI, 1988 |
| Atlantic silverside (Menidia menidia) | 0.5-4.5 | USEPA, 1986; USDI, 1988 |
| Tidewater silverside(Menidia peninsulae) | 0.4-4.2 | USEPA, 1986; USDI, 1988 |
| Striped bass (Morone saxatilis) | 0.58 | USEPA, 1986 |
| Striped mullet (Mugil cephalus) | 5.4 | Schimmel et al., 1983 |
| Gulf toadfish (Opsanus beta) | 520 | USEPA, 1986; USDI, 1988 |
| Fresh Water Invertebrates | ||
| Snail (Aplexa hypnorum) | >806 | USEPA, 1986 |
| Amphipod (Gammarus lacustris) | 0.11-0.32 | USEPA, 1986 |
| Amphipod (Gammarus pseudolimnaeus) | 0.18 | USEPA, 1986 |
| Crayfish (Orconectes immunis) | 6 | USEPA, 1986 |
| Stonefly (Pteronarcella badia) | 0.38-10.0 | USEPA, 1986 |
| Stonefly (Claasseia sabulosa) | 0.57 | USDI, 1988 |
| Pygmy backswimmer (Neopiea striola) | 1.22-1.56 | USEPA, 1986 |
| Crawing water beetle (Peitodytes) | 0.8 | USEPA, 1986 |
| Salt Water Invertebrates | ||
| Eastern Oyster (Crassostrea virginico) | 1,991 | USEPA, 1986 |
| Mysid (Mysidopsis bahia) | 0.035-0.056 | USEPA, 1986; Schimmel et al., 1988 |
| Amphipod (Ampelisca abdita) | 0.16 | USEPA, 1986 |
| Amphipod (Rhepoxynius abronius) | 0.14 | USEPA, 1986 |
| Korean shrimp(Palaemon macrodactylus) | 0.01-0.25 | USEPA, 1986 |
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