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Rochia nilotica   (Linnaeus, 1767)

Commercial top
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Rochia nilotica

Philippines country information

Common names: [No common name]
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: commercial | Ref: Poutiers, J.M., 1998
Aquaculture: never/rarely | Ref:
Regulations: no regulations | Ref:
Uses: no uses
Comments: Commercial fisheries (Ref. 349). Known throughout the Philippines, e.g., Samar (Ref. 821), Panay. This is collected by gleaning (Ref. 128042). Threatened (Ref. 89179). C: Refs. 349, 821, 8326, 75835, 90322, 97545, 106765, 106766,121724, 128042, 128987; M: Ref. 349; O: Refs. 821, 86518, 89179, 128042.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/rp.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Dolorosa, R.G., R.M. Picardal and S.F. Conales Jr., 2015
National Database:

Common names from other countries

Commercial top shell, ... more

Classification / Names / Names Κοινά ονόματα | Συνώνυμα | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS

> Trochida () > Tegulidae () > Trochinae

Environment: milieu / climate zone / depth range / distribution range Οικολογία

; εύρος βάθους 0 - 20 m (Ref. 349).   Tropical; 32°N - 25°S, 45°E - 171°E (Ref. 81851)

Κατανομή Χώρες | Περιοχές FAO | Οικοσυστήματα | Παρουσίες | Εισαγωγές

Indo-Pacific: from Madagascar, Sri Lanka, Andaman and Nicobar Islands, to as far east as French Polynesia, north to southern Japan and Hawaii, and south to Australia.

Length at first maturity / Μέγεθος / Βάρος / Age

Maturity: Lm ?  range ? - ? cm Max length : 15.0 cm SHH αρσενικό/απροσδιόριστο; (Ref. 349); common length : 11.0 cm SHL αρσενικό/απροσδιόριστο; (Ref. 349)

Short description Μορφολογία

Shell conical, large, thick and very heavy. Body whorl almost smooth, with concave sides above a protuding, acutely rounded and thickened periphery. Base shell flat. Aperture squarish. Colouration: shell off-white, with large irregular axial reddish stripes (Ref. 128042).

Βιολογία     Γλωσσάρι (π.χ. epibenthic)

It is the most economically important gastropod species in the tropical West Pacific. It is both an important traditional food and a leading export item used as a source of mother-of-pearl material for buttons and jewelry. Many small sized artisanal fisheries for meat and shell exist in other islands of the area. Due to severe and frequent overfishing, management policies are often adopted and aquaculture trials are under way (Ref. 349). Maximum depth from Ref. 799. Typically found in shallow, high energy portions of barrier and reefs (Refs. 349, 128042). Feeds on filamentous algae and generally avoids bottoms of sand and living corals. Population density generally decreasing in deeper areas, while the mean size of individuals increases (Ref. 349).

Life cycle and mating behavior Γεννητική Ωρίμανση | Αναπαραγωγή | Γεννοβολία | Αβγά | Γονιμότητα | Προνύμφες

Breeding period is marked by spring tides with external fertilization and nocturnal spawning.

Main reference Αναφορές | Συντονιστής | Συνεργάτες

Poutiers, J.M. 1998. (Ref. 349)

IUCN Red List Status (Ref. 130435)

  Not Evaluated 

CITES status (Ref. 108899)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless

Human uses

αλιεία: Εμπορικό(ά)
FAO - αλιεία: landings | FishSource | Η θάλασσα γύρω μας

Εργαλεία

E-book | Οδηγός πεδίου

Διαδικτυακές πηγές

BHL | BOLD Systems | CISTI | DiscoverLife | FAO(αλιεία: ; publication : search) | GenBank (genome, nucleotide) | GloBI | Gomexsi | Google Books | Google Scholar | Google | PubMed | Δέντρο Ζωής | Wikipedia (Go, αναζήτηση) | Zoological Record

Estimates based on models

Preferred temperature (Ref. 115969): 26.3 - 29.3, mean 28.7 (based on 2725 cells).
Ελαστικότητα (Ref. 69278) Μεσαίο(α), ελάχιστος χρόνος για διπλασιασμό πληθυσμού 1,4 - 4,4 έτη (K=0.19-0.36).
Vulnerability (Ref. 71543): Low vulnerability (10 of 100).
Price category (Ref. 80766): Unknown.