PAN Pesticides Database - Chemical Toxicity Studies on Aquatic Organisms

Acute Aquatic Ecotoxicity Summaries for Malathion on All Taxa Groups

Use(s): Insecticide    Chem Class: Organophosphorus    U.S. EPA PC Code:057701, 857701    CAS Number: 121-75-5
Sorted by Organism Group, Scientific Name and LC50. Species summary toxicity data are derived from the U.S. EPA AQUIRE database.
Records 1 to 50 of 273
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Common Name Scientific Name Avg Species LC50 (ug/L) LC50 Std Dev Number of Studies Avg Species Rating Outlier Result for Organism Group?

Amphibians

Frog and toad order Anura 5,000 - 1 Moderately Toxic  
American toad Bufo americanus 5,900 - 1 Moderately Toxic  
Toad Bufo arenarum 19,200 - 1 Slightly Toxic  
Woodhouse's Toad Bufo woodhousei 420.0 - 1 Highly Toxic  
Fowler's toad Bufo woodhousei fowleri 940.0 679.6 3 Highly Toxic  
Gray tree frog Hyla versicolor 4,130 - 1 Moderately Toxic  
Striped, Northern chorus frog Pseudacris triseriata 320.0 169.7 3 Highly Toxic  
Western chorus frog Pseudacris triseriata triseria 320.0 - 1 Highly Toxic  
Bullfrog Rana catesbeiana 1,500 - 1 Moderately Toxic  
Green frog Rana clamitans 3,650 - 1 Moderately Toxic  
Frog Rana hexadactyla 1.24 1.15 5 Very Highly Toxic  
Bog frog Rana limnocharis 2,271 - 1 Moderately Toxic  
Leopard frog Rana pipiens 2,400 - 1 Moderately Toxic  
Lowland frog Rana ridibunda 38,000 - 1 Slightly Toxic Outlier 
Wood frog Rana sylvatica 1,250 - 1 Moderately Toxic  
Tiger frog, indian bullfrog Rana tigrina 170.0 - 1 Highly Toxic  
Clawed toad Xenopus laevis 10,900 - 1 Slightly Toxic  

 
Annelida

Oligochaete Branchiura sowerbyi 4,570 - 1 Moderately Toxic  
Leech Erpobdella octoculata 41,500 14,500 2 Slightly Toxic  
Oligochaete, worm Lumbriculus variegatus 25,700 5,200 2 Slightly Toxic  
Tubificid worm Tubifex sp. 45,620 1,979 5 Slightly Toxic  
Oligochaete family Tubificidae 39,024 29,219 5 Slightly Toxic  

 
Crustaceans

Aquatic sowbug Asellus aquaticus 60,620 19,349 5 Slightly Toxic Outlier 
Aquatic sowbug Asellus brevicaudus 4,500 1,500 2 Moderately Toxic  
Crab Barytelphusa cunicularis 6,205 1,847 4 Moderately Toxic  
Dungeness or edible crab Cancer magister 665.6 664.4 2 Highly Toxic  
Bay shrimp, Sand shrimp Crangon septemspinosa 163.0 93.1 3 Highly Toxic  
Ostracod Cypretta kawatai 197.5 146.5 2 Highly Toxic  
Ostracod Cypria sp. 2.00 - 1 Very Highly Toxic  
Ostracod, Seed shrimp Cypridopsis vidua 133.5 86.5 2 Highly Toxic  
American lobster Homarus americanus 20.9 17.1 2 Very Highly Toxic  
White shrimp Litopenaeus vannamei 21.5 - 1 Very Highly Toxic  
Prawn Macrobrachium lamarrei 1,488 888.8 5 Moderately Toxic  
Giant river prawn Macrobrachium rosenbergii 87.8 101.2 6 Very Highly Toxic  
Sand shrimp Metapenaeus monoceros 1,482 263.8 5 Moderately Toxic  
Opposum Shrimp Neomysis mercedis 2.22 0.96 4 Very Highly Toxic  
Crayfish Orconectes nais 5,118 4,883 4 Moderately Toxic  
Crab Oziotelphusa senex senex 10,200 4,031 4 Slightly Toxic  
Longwrist hermit crab Pagurus longicarpus 100.3 14.3 3 Highly Toxic  
Korean or Oriental shrimp Palaemon macrodactylus 45.2 36.2 2 Very Highly Toxic  
Crab Paratelphusa hydrodromus 6,000 - 1 Moderately Toxic  
Freshwater shrimp Paratya compressa improvisa 3.62 - 1 Very Highly Toxic  
Northern pink shrimp Penaeus duorarum 12.2 0.25 2 Very Highly Toxic  
Indian prawn Penaeus indicus 111.0 138.9 12 Highly Toxic  
Jumbo tiger prawn Penaeus monodon 510.0 92.7 4 Highly Toxic  
White river crayfish Procambarus acutus acutus 50,000 - 1 Slightly Toxic  
Red swamp crayfish Procambarus clarkii 17,420 22,451 3 Slightly Toxic  
Fairy shrimp Streptocephalus proboscideus 72,964 8,536 2 Slightly Toxic Outlier 
Fairy shrimp Streptocephalus rubricaudatus 73,700 - 1 Slightly Toxic Outlier 
Fairy shrimp Streptocephalus texanus 54,600 - 1 Slightly Toxic  
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