External Anatomy and MorphologyPrepared by:• Esteves, Arvin Kelly• Icaro, Sarah Jane• Jazareno, Janella Mariz• Lagajino, Stephen
External Anatomy and Morphology• Gnathonodon
Gnathonodon (Jack)
Body Index (BI)
=
= 0.31
Metric Data (cm) TL: 10.5 SL: 8.5 FL: 9.0 BD: 3.3 BW: 0.5
Meristic Data Fins
Paired : pectoral & pelvic Unpaired : dorsal, ventral & anal
Position of fins: Pectoral – anterior, mid-body Pelvic - thoracic
Meristic Data Spines (S) & Soft Rays (SR)
D, VIII, 20 Ventral: S – 3, SR – 17
Caudal Fin (Shape) forked
Caudal Peduncle narrow
Other Meristic Features Mouth
Location: terminal (+) dentition,
villiform
Gill rakers long
(+) scutes
Inferences Compressiform Slow-swimmer Pelagic Predator & filter feeder
External Anatomy and Morphology• Alectis
Alectis (African Pompano)
Metric Data (cm) TL: 13.5 SL: 10 FL: 9.0 BD: 4.6 BW: 1.1
Body Shape Index (BSI)BSI= BD/ TL
= 4.6 cm / 13.5 cm
= 0.34
Meristic Data Fins
Paired : pectoral & pelvic (both are separated); dorsal (one is anterior to the other; discontinuous)
Unpaired :ventral
Position of fins: Pectoral – slightly ventral, mid-body Pelvic - thoracic
Meristic Data Spines (S) & Soft Rays (SR) (RAW DATA)
S – 0 SR – 6 (ant) + 26 (post)
Spines (S) & Soft Rays (SR) (Fishbase) Dorsal: D VIII 22 Ventral: V III 17
Meristic Data Body Shape
compressiform
Caudal Fin (shape) forked
Caudal Peduncle narrow
Other Meristic Features Lateral line
(+) Continuous Curved Dorsal
Mouth Location: superior (+) dentition:
villiform
Gill rakers Long
Eyes Side, dorsal
Other Meristic Features (+) scutes – found laterally on caudal
peduncle
Inference Compressiform- Live in many places to take refuge like
ponds, lakes, and corals - School together in shallow open waters Superior mouth- catching prey above
them Lateral, dorsal eyes- for selective
predation
Inference Forked tails have less water to displace
but it supports sustained rapid swimming
Dentition and gill rakers support their feeding on zooplankton
External Anatomy and Morphology• Pterocaesio
Pterocaesio (Fusiliers)
Metric Data (cm) TL: 14.4 SL: 15.3 FL: 16.3 BD: 4.0 BW: 2.3
Body Shape Index (BSI)BSI = BD/ TL
= 4.0 cm / 14.4 cm
= 0.21
Meristic Data Fins
Paired : pectoral & pelvic
Unpaired : dorsal, caudal, and ventral
Position of fins: Pectoral – slightly ventral, mid-body Pelvic – not fused, thoracic
Meristic Data Spines (S) & Soft Rays (SR)
D IX 16Caudal Fin (Shape) Lunate Caudal peduncle: narrow
Other Meristic Features Lateral line
(+) Continuous Straight Dorsal
Mouth Location: terminal 1.5 cm (-) dentition
Gill filament Hair like
Inference Fusiform Feeds on zooplankton Reef-associated Relatively fast swimmers
External Anatomy and Morphology• Nemipterus
Nemipterus (Threadfin bream)
Metric Data (cm) TL: 15.9 SL: 12.9 FL: 14 BD: 3.5 BW: 1.4
Body Shape Index (BSI)BSI = BD/ TL
= 3.5 cm / 15.9 cm
= 0.22
Meristic Data Fins
Paired : pectoral & pelvic
Unpaired : dorsal, anal
Position of fins: Pectoral – slightly ventral, mid-body Pelvic – not fused, thoracic
N. furcosus
Meristic Data Spines (S) & Soft Rays (SR)
D VIII 7 Caudal Fin (Shape)
Semilunate Caudal peduncle
Relatively thick
Other Meristic Features Lateral line
(+) Continuous Curved Dorsal
Mouth Location: terminal (+) dentition:
villiform
Gill rakers Short; knobby
Eyes side
Body Shape fusiform
Inferences Fusiform Eat small fishes, cephalopods and
crustaceans Fast, active swimmers
Some capable of short burst of speed Can fit into tight spaces