''Lutjanus johnii'', John's snapper, the golden snapper, big-scaled bream, fingermark bream, fingermark seaperch, John's sea-perch, or spotted-scale sea perch, is a species of marine

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or hor ...

, a snapper belonging to the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Lutjanidae. It is native to the western Pacific and Indian Oceans.

Taxonomy

''Lutjanus johnii'' was first formally described in 1792 as ''Anthias johnii'' by the German naturalist Marcus Elieser Bloch with the type locality given as

Surat Surat is a city in the western Indian state of Gujarat. The word Surat literally means ''face'' in Gujarati and Hindi. Located on the banks of the river Tapti near its confluence with the Arabian Sea, it used to be a large seaport. It is now ...

where the

Tapti River The Tapti River (or Tapi) is a river in central India located to the south of the Narmada river that flows westwards before draining into the Arabian Sea. The river has a length of around and flows through the states of Maharashtra, Gujarat ...

estuary meets the

Gulf of Khambhat The Gulf of Khambhat, historically known as the Gulf of Cambay, is a bay on the Arabian Sea coast of India, bordering the state of Gujarat just north of Mumbai and Diu Island. The Gulf of Khambhat is about long, about wide in the north and u ...

in the

Arabian Sea The Arabian Sea ( ar, اَلْبَحرْ ٱلْعَرَبِيُّ, Al-Bahr al-ˁArabī) is a region of the northern Indian Ocean bounded on the north by Pakistan, Iran and the Gulf of Oman, on the west by the Gulf of Aden, Guardafui Channel ...

. The

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

, ''johnii'', honours the

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...

naturalist

Christoph Samuel John Christoph Samuel John (11 August 1747 – 1 September 1813) was a German missionary in the service of the Danish-Halle Mission in southern India at the Danish settlement of Tranquebar (Tharangambadi). He promoted schools, natural theology, and coll ...

(1747–1813), who was a

missionary A missionary is a member of a Religious denomination, religious group which is sent into an area in order to promote its faith or provide services to people, such as education, literacy, social justice, health care, and economic development.Tho ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

from 1771 until his death and who collected specimens for Bloch at the

Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish ance ...

colony of

Tranquebar Tharangambadi (), formerly Tranquebar ( da, Trankebar, ), is a town in the Mayiladuthurai district of the Indian state of Tamil Nadu on the Coromandel Coast. It lies north of Karaikal, near the mouth of a distributary named Uppanar of the Kave ...

Description

''Lutjanus johnii'' has a moderatel deep body in which its standard length is 2,4 to 2.9 its depth at the deepest point. It has a steeply sloped forehead and the incision and know on the preoperculum are weakly developed The vomerine teeth are arranged in a crescent shaped patch with no rearwards extension although there is a patch of granular teeth on the tongue. The

dorsal fin A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through conv ...

has 10 spines and 13-14 soft rays while the

anal fin Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as se ...

has 3 spines and 8 soft rays. The soft part of the dorsal fin and the anal fin have a rounded shape. The pectoral fins have 16 or 17 rays and the

caudal fin Fins are distinctive anatomical features composed of bony spines or rays protruding from the body of a fish. They are covered with skin and joined together either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as se ...

is truncate or weakly

emarginate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular o ...

. This fish attains a maximum

total length Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish ...

of , although is more typical, and the maximum published weight is . The overall colour is yellow, with a sheen of bronze or silvery, becoming silvery-white on the abdomen. There is a rusty spot at the centre of each scale creating the appearance of horizontal lines along the flanks. There is a sizeable black blotch below the front of the soft rayed part of the dorsal fin which is mostly above the

lateral line The lateral line, also called the lateral line organ (LLO), is a system of sensory organs found in fish, used to detect movement, vibration, and pressure gradients in the surrounding water. The sensory ability is achieved via modified epithelial ...

, although this may be absent in adults.

Distribution and habitat

''Lutjanus johnii'' has a wide

Indo-Pacific The Indo-Pacific is a vast biogeographic region of Earth. In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the ...

distribution. It occurs from the eastern African coast where it ranges from the southern

Red Sea The Red Sea ( ar, البحر الأحمر - بحر القلزم, translit=Modern: al-Baḥr al-ʾAḥmar, Medieval: Baḥr al-Qulzum; or ; Coptic: ⲫⲓⲟⲙ ⲛ̀ϩⲁϩ ''Phiom Enhah'' or ⲫⲓⲟⲙ ⲛ̀ϣⲁⲣⲓ ''Phiom ǹšari''; T ...

to South Africa, across the Indian Ocean into the Pacific as far as Fiji. It is found as far north as the

Ryukyu Islands The , also known as the or the , are a chain of Japanese islands that stretch southwest from Kyushu to Taiwan: the Ōsumi, Tokara, Amami, Okinawa, and Sakishima Islands (further divided into the Miyako and Yaeyama Islands), with Yonaguni ...

of southern Japan and south to northern Australia. It has a depth range of . The adult fish are thought to be inhabitants of coral reefs while the juveniles use the shelter of mangroves.

Biology

''Lutjanus johnii'' is a predatory species which preys on fishes and

benthic The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from ancient Greek, βένθος (bénthos), meaning "t ...

invertebrates such as

crustaceans Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group ...

and

cephalopods A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, an ...

. Spawning has been observed during September in the

Andaman Sea The Andaman Sea (historically also known as the Burma Sea) is a marginal sea of the northeastern Indian Ocean bounded by the coastlines of Myanmar and Thailand along the Gulf of Martaban and west side of the Malay Peninsula, and separated from ...

. It is more numerous over deep reefs than it is over reefs in shallower waters. In Australian waters ''L. johnii'' is one of the dominant, large snappers in the nearshore fish fauna of reefs. The large adults school in turbid waters around hard substrates in silty and sandy coastal and offshore areas.

Fisheries

''Lutjanus johnii'' is frequently recorded in markets throughout its range and is caught using handlines, bottom longlines, traps and bottom trawls. The catch is sold fresh or dried salted. it is a popular game fish for recreational anglers in Australia.

References

External links

Fishes of Australia : ''Lutjanus johnii''
{{Taxonbar, from=Q2304783 johnii Marine fish of Northern Australia Fish described in 1792