Unable to swim effectively without their dorsal fins
, they sink to the bottom of the sea and die of suffocation or are eaten by other predators.
Among above four species, Platycephalus indicus was the only one that had the first dorsal fin
with a single small isolated spine anteriorly and the caudal fin with a yellow marking on the middle when fresh (Fig.
A perusal at the result revealed a significant positive correlation between standard length and bodyweight, total length and body weight, standard length and total length, dorsal fin
length and body width and head length and dorsal fin
Above, the dorsal fin
of the |basking shark which the pair spotted off Flamborough
PHDB (posterior 19.11-25.68 28.58-27.63 head--anterior dorsal fin
mm %SL Total length 627 Fork length 585 Standard length 545 Head length 140 25.69 1st Pre-dorsal length 130 23.85 2nd Pre-dorsal length 429 78.71 Pre-pectoral length 136 24.95 Pre-pelvic length 143 26.24 Pre-anal length 430 78.90 Head length 153 28.07 Body depth 59 10.82 Head depth 50 9.17 Caudal peduncles depth 21 3.85 %HL Snout length 73 52.14 Upper-jaw length 75 53.57 Pre-orbital length 74 53.86 Inter-orbital length 19 13.57 Eye diameter 18 12.86 1st Dorsal fin
elements XIX 2nd Dorsal fin
elements I--21 Anal fin elements I--21 Pelvic fin elements I--5 Pectoral ray fins 13
Diagnosis: Austrolebias bagual can be uniquely diagnosed from all other species of Austrolebias by the unique colour pattern on the body and dorsal fin
Eight to nine supraneurals present between head and anterior part of dorsal fin
, without cartilage on upper and lower edges, and with medial sensorial canal.
The first group of parameters which were differentiated as factor one (F1) viz., fish body weight, total length, dorsal fin
length, caudal fin length, anal fin length, average length of the paired pectoral fins and average length of paired pelvic fins, accounted for 64.245% of the cumulative variability while the second differentiated group was on the basis of fork length of the fish body determined as factor two (F2) accounted for 16.028% of the cumulative variability (Table 4).
ANSWERS: 1 Buster Keaton; 2 Peking Man; 3 Portuguese; 4 The Nissen hut; 5 Burke and Hare; 6 Brendan Behan; 7 Vidkun Quisling; 8 Andorra; 9 The Aviator; 10 The dorsal fin
Australian authorities believe the propeller of a ferry injured the whale whilst it was swimming, causing a gash near its dorsal fin
These small fish, around 15 cm in length, have venomous spines along their dorsal fin
which deliver a painful sting if stepped on.