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