Twenty Thousand Leagues Under the Seas Part 25

Everyone knows that fish make up the fourth and last cla.s.s in the vertebrate branch. They have been quite aptly defined as: "cold-blooded vertebrates with a double circulatory system, breathing through gills, and designed to live in water."

They consist of two distinct series: the series of bony fish, in other words, those whose spines have vertebrae made of bone; and cartilaginous fish, in other words, those whose spines have vertebrae made of cartilage.

Possibly the Canadian was familiar with this distinction, but Conseil knew far more about it; and since he and Ned were now fast friends, he just had to show off. So he told the harpooner:

"Ned my friend, you're a slayer of fish, a highly skilled fisherman.

You've caught a large number of these fascinating animals.

But I'll bet you don't know how they're cla.s.sified."

"Sure I do," the harpooner replied in all seriousness.

"They're cla.s.sified into fish we eat and fish we don't eat!"

"Spoken like a true glutton," Conseil replied. "But tell me, are you familiar with the differences between bony fish and cartilaginous fish?"

"Just maybe, Conseil."

"And how about the subdivisions of these two large cla.s.ses?"

"I haven't the foggiest notion," the Canadian replied.

"All right, listen and learn, Ned my friend! Bony fish are subdivided into six orders. Primo, the acanthopterygians, whose upper jaw is fully formed and free-moving, and whose gills take the shape of a comb.

This order consists of fifteen families, in other words, three-quarters of all known fish. Example: the common perch."

"Pretty fair eating," Ned Land replied.

"Secundo," Conseil went on, "the abdominals, whose pelvic fins hang under the abdomen to the rear of the pectorals but aren't attached to the shoulder bone, an order that's divided into five families and makes up the great majority of freshwater fish. Examples: carp, pike."

"Ugh!" the Canadian put in with distinct scorn. "You can keep the freshwater fish!"

"Tertio," Conseil said, "the subbrachians, whose pelvic fins are attached under the pectorals and hang directly from the shoulder bone.

This order contains four families. Examples: flatfish such as sole, turbot, dab, plaice, brill, etc."

"Excellent, really excellent!" the harpooner exclaimed, interested in fish only from an edible viewpoint.

"Quarto," Conseil went on, unabashed, "the apods, with long bodies that lack pelvic fins and are covered by a heavy, often glutinous skin, an order consisting of only one family. Examples: common eels and electric eels."

"So-so, just so-so!" Ned Land replied.

"Quinto," Conseil said, "the lophobranchians, which have fully formed, free-moving jaws but whose gills consist of little tufts arranged in pairs along their gill arches. This order includes only one family. Examples: seahorses and dragonfish."

"Bad, very bad!" the harpooner replied.

"s.e.xto and last," Conseil said, "the plectognaths, whose maxillary bone is firmly attached to the side of the intermaxillary that forms the jaw, and whose palate arch is locked to the skull by sutures that render the jaw immovable, an order lacking true pelvic fins and which consists of two families. Examples: puffers and moonfish."

"They're an insult to a frying pan!" the Canadian exclaimed.

"Are you grasping all this, Ned my friend?" asked the scholarly Conseil.

"Not a lick of it, Conseil my friend," the harpooner replied.

"But keep going, because you fill me with fascination."

"As for cartilaginous fish," Conseil went on unflappably, "they consist of only three orders."

"Good news," Ned put in.

"Primo, the cyclostomes, whose jaws are fused into a flexible ring and whose gill openings are simply a large number of holes, an order consisting of only one family. Example: the lamprey."

"An acquired taste," Ned Land replied.

"Secundo, the selacians, with gills resembling those of the cyclostomes but whose lower jaw is free-moving. This order, which is the most important in the cla.s.s, consists of two families. Examples: the ray and the shark."

"What!" Ned Land exclaimed. "Rays and man-eaters in the same order?

Well, Conseil my friend, on behalf of the rays, I wouldn't advise you to put them in the same fish tank!"

"Tertio," Conseil replied, "The sturionians, whose gill opening is the usual single slit adorned with a gill cover, an order consisting of four genera. Example: the sturgeon."

"Ah, Conseil my friend, you saved the best for last, in my opinion anyhow! And that's all of 'em?"

"Yes, my gallant Ned," Conseil replied. "And note well, even when one has grasped all this, one still knows next to nothing, because these families are subdivided into genera, subgenera, species, varieties--"

"All right, Conseil my friend," the harpooner said, leaning toward the gla.s.s panel, "here come a couple of your varieties now!"

"Yes! Fish!" Conseil exclaimed. "One would think he was in front of an aquarium!"

"No," I replied, "because an aquarium is nothing more than a cage, and these fish are as free as birds in the air!"

"Well, Conseil my friend, identify them! Start naming them!"

Ned Land exclaimed.

"Me?" Conseil replied. "I'm unable to! That's my employer's bailiwick!"

And in truth, although the fine lad was a cla.s.sifying maniac, he was no naturalist, and I doubt that he could tell a bonito from a tuna.

In short, he was the exact opposite of the Canadian, who knew nothing about cla.s.sification but could instantly put a name to any fish.

"A triggerfish," I said.

"It's a Chinese triggerfish," Ned Land replied.

"Genus Balistes, family Scleroderma, order Plectognatha,"

Conseil muttered.

a.s.suredly, Ned and Conseil in combination added up to one outstanding naturalist.

The Canadian was not mistaken. Cavorting around the Nautilus was a school of triggerfish with flat bodies, grainy skins, armed with stings on their dorsal fins, and with four p.r.i.c.kly rows of quills quivering on both sides of their tails.

Nothing could have been more wonderful than the skin covering them: white underneath, gray above, with spots of gold sparkling in the dark eddies of the waves. Around them, rays were undulating like sheets flapping in the wind, and among these I spotted, much to my glee, a Chinese ray, yellowish on its topside, a dainty pink on its belly, and armed with three stings behind its eyes; a rare species whose very existence was still doubted in Lacpde's day, since that pioneering cla.s.sifier of fish had seen one only in a portfolio of j.a.panese drawings.

For two hours a whole aquatic army escorted the Nautilus. In the midst of their leaping and cavorting, while they competed with each other in beauty, radiance, and speed, I could distinguish some green wra.s.se, bewhiskered mullet marked with pairs of black lines, white gobies from the genus Eleotris with curved caudal fins and violet spots on the back, wonderful j.a.panese mackerel from the genus s...o...b..r with blue bodies and silver heads, glittering azure goldfish whose name by itself gives their full description, several varieties of porgy or gilthead (some banded gilthead with fins variously blue and yellow, some with horizontal heraldic bars and enhanced by a black strip around their caudal area, some with color zones and elegantly corseted in their six waistbands), trumpetfish with flutelike beaks that looked like genuine seafaring woodc.o.c.ks and were sometimes a meter long, j.a.panese salamanders, serpentine moray eels from the genus Echidna that were six feet long with sharp little eyes and a huge mouth bristling with teeth; etc.

Our wonderment stayed at an all-time fever pitch.

Our exclamations were endless. Ned identified the fish, Conseil cla.s.sified them, and as for me, I was in ecstasy over the verve of their movements and the beauty of their forms.