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Brevoortia aurea, commonly known as Lacha or Argentine Menhaden, is a species of marine ray-finned fish in the family Clupeidae. It is a schooling pelagic fish, forming large aggregations in coastal waters. Like other menhaden, it is a filter feeder, playing a crucial role in marine ecosystems by consuming phytoplankton and zooplankton. It is characterized by its deep, compressed body and large head.
Fyzické charakteristiky
- Tvar tela
- compressed
- Sfarbenie
- Silvery flanks, darker bluish-green dorsum. Often has a dark spot behind the operculum, followed by several rows of smaller spots along the sides.
- Typ šupín
- cycloid
- Poloha úst
- terminal
- Charakteristické znaky
- Deep, compressed body, Large head with a prominent snout, Large, deeply forked caudal fin, Pectoral fins relatively small, Single dorsal fin located mid-body, Prominent dark spot behind the operculum, often followed by smaller spots
- Chrbtová plutva
- Single dorsal fin, typically with 17-20 soft rays. Originates slightly anterior to the pelvic fin insertion.
- Chvostová plutva
- Deeply forked caudal fin, with two equally sized lobes.
- Prsná plutva
- Small, located low on the body, with 15-17 rays.
- Charakteristické plutvy
- Pelvic fins are small, located abdominally, with 7 rays. Anal fin is relatively long, with 20-26 soft rays.
Tipy na identifikáciu
Body Shape
Look for a very deep, laterally compressed body, characteristic of menhaden.
Coloration
Silvery sides with a darker back, and a distinct dark spot behind the gill cover, often followed by smaller spots in rows.
Head Size
Relatively large head compared to body size, with a blunt snout.
Fins
Deeply forked caudal fin and a single dorsal fin positioned centrally on the back.
Mouth
Terminal mouth, adapted for filter feeding, often appearing wide when open.
Biotop
- Typ vody
- saltwater
- Hĺbka
- Typically found in shallow coastal waters, estuaries, and bays, from the surface down to about 50 meters.
- Prostredie
- Pelagic, schooling in large aggregations in coastal and estuarine environments. Prefers turbid waters.
- Geografický výskyt
- Southwestern Atlantic Ocean, primarily along the coast of South America from southern Brazil (Rio Grande do Sul) south to Argentina (Patagonia).
Informácie o akváriu
- Úroveň náročnosti chovu: expert
- Temperament: peaceful
- Strava: filter_feeder
- Minimálna veľkosť akvária: Not suitable for home aquaria due to size and specialized feeding requirements.
- Teplota: 15-25°C (59-77°F)
- Hodnota pH: 7.8-8.4
- Tvrdosť vody: 10-15 dKH
- Kompatibilita: Not compatible with typical aquarium setups. Best kept in large public aquariums with specialized filtration.
- Špeciálne požiadavky: Requires extremely large, open tanks with strong filtration to handle their filter-feeding waste. Specialized feeding protocols for phytoplankton and zooplankton are essential.
Informácie z voľnej prírody
- Stav ochrany: least concern
- Sezónnosť: Present year-round in its distribution, with seasonal aggregations for spawning and feeding.
- Trhová cena: Low to moderate, primarily for bait, fishmeal, and oil.
- Komerčný význam: medium
- Chuť: Oily, strong flavor
- Textúra: Soft, flaky
- Spôsoby prípravy: Smoked, Grilled (less common), Used in fishmeal and oil production
- Nutričná hodnota: High in Omega-3 fatty acids, protein, and Vitamin D.
Kľúčové fakty
Ecological Rolebehavior
Brevoortia aurea is a crucial forage fish, serving as a primary food source for many larger predatory fish, marine mammals, and seabirds in its ecosystem.
Filter Feederbehavior
Like all menhaden, B. aurea is a filter feeder, using its specialized gill rakers to strain phytoplankton and zooplankton from the water. This process helps to clarify coastal waters.
Schooling Behaviorbehavior
These fish form massive, dense schools, which can be observed near the surface, especially during feeding and spawning periods. This schooling behavior offers protection from predators.
Commercial Useinteresting
While not highly valued for direct human consumption due to its oily flesh, B. aurea is commercially important for reduction to fishmeal and fish oil, and as bait for other fisheries.
Bezpečnostné informácie
Bezpečná- Úroveň bezpečnosti: safe
- Jedovatá: Nie
- Jedlosť: edible
- Poznámky k manipulácii: No specific handling precautions are required. They are not venomous and do not possess sharp spines that pose a significant threat. Handle with care to avoid damaging the fish if releasing.
Podobné druhy
Brazilian Menhaden
Brevoortia pectinata
B. pectinata generally has a more elongated body, a smaller head, and fewer gill rakers than B. aurea. The dark spot behind the operculum in B. pectinata is often less pronounced or absent, and the lateral spots are typically less organized into distinct rows.
Atlantic Menhaden
Brevoortia tyrannus
Geographically distinct (Atlantic coast of North America). B. tyrannus typically has a more robust body and a more pronounced dark spot behind the operculum, often with additional smaller spots in a single row, whereas B. aurea can have multiple rows.
Vedecká klasifikácia
- Ríša
- Animalia
- Kmeň
- Chordata
- Trieda
- Actinopterygii
- Rad
- Clupeiformes
- Čeľaď
- Clupeidae
- Rod
- Brevoortia
- Druh
- Brevoortia aurea
Preskúmajte Lacha
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