Paracalanus parvus

are eaten by

• Global Biotic Interactions: Sabellastarte magnifica (Shaw 1800)
• Global Biotic Interactions: Limanda limanda (Linnaeus 1758) (ليمندة مألوفة)
• Global Biotic Interactions: Palythoa caribaeorum Duchassaing & Michelotti 1860
• Global Biotic Interactions: Terrazoanthus minutus (Duerden 1898)
• Global Biotic Interactions: Nicidion mutilata (Webster 1884)

are host of

• Global Biotic Interactions: Syndinium turbo
• Global Biotic Interactions: Syndinium turbo
• Global Biotic Interactions: Blastodinium contortum
• Global Biotic Interactions: Syndinium turbo
• Global Biotic Interactions: Blastodinium contortum

are parasitized by

• Global Biotic Interactions: Grillotia (Grillotia) erinaceus (van Beneden 1858) Guiart 1927
• Global Biotic Interactions: Contracaecum osculatum

are preyed upon by

• Global Biotic Interactions: Caprella fretensis Stebbing 1878
• Global Biotic Interactions: Pollachius virens (Linnaeus 1758) (قدّيّة سوداء)
• Global Biotic Interactions: Sardina pilchardus (Walbaum 1792) (سردين)
• Global Biotic Interactions: Pollachius pollachius (Linnaeus 1758)
• Global Biotic Interactions: Merlangius merlangus (Linnaeus 1758) (غُبَر)

eat

• Global Biotic Interactions: Synedra undulata Schumann 1862
• Global Biotic Interactions: Bacillaria paradoxa
• Global Biotic Interactions: Cylindrotheca closterium
• Global Biotic Interactions: Emiliania huxleyi (إميليانية هكسلية)
• Global Biotic Interactions: Helicotheca tamesis

have endoparasite

• Global Biotic Interactions: Grillotia (Grillotia) erinaceus (van Beneden 1858) Guiart 1927
• Global Biotic Interactions: Contracaecum osculatum

prey on

• Global Biotic Interactions: Calanus helgolandicus (Claus 1863)
• Global Biotic Interactions: Pseudocalanus elongatus (Brady 1865)
• Global Biotic Interactions: Paracalanus parvus
• Global Biotic Interactions: Eucalanus elongatus elongatus