[Choosing a Spot] The Equation for Conquering Fields: Breakwaters, Rocky Shores, Surf... | The Physics of Terrain Analysis to Expose the Lie That 'Crowds = Good Fishing'
Hey, all you eging refugees. Have you ever felt despair on a weekend night, looking at a breakwater where the lights of headlamps are strung together like beads? 'I came here because the internet said it was a good spot, but there's not even a gap to squeeze into.' 'I had no choice but to cast from the edge, but there was zero sign of any fish.' In the end, you get tangled with the angler next to you and head home in an awkward atmosphere.
……Sorry, but as long as you keep repeating that, you'll be a 'sucker (easy mark)' for life.
Let me be clear. Throw that brain-dead equation of 'lots of people = good fishing spot' into the ocean right now. That's just a 'place where fish were caught in the past,' not necessarily a 'place where squid are right now.' In fact, you're choosing the 'highest difficulty battlefield' where you're dealing with squid that have been pressured to the point of being completely wary.
What you really need to get your hands on isn't expired information from social media saying 'I caught one!'. It's the 'eye' to logically identify a paradise with no one around (an un-fished spot) using the 'terrain map' of Google Maps and the 'sea conditions' right in front of you.
Today, I'm going to use physics to expose the 'fatal weakness' of the bigfin reef squid and hammer home the 'absolute law of spot selection' that works for every field: breakwaters, rocky shores, and surf. By the time you finish reading this article, you should understand just how inefficient the tip of a crowded breakwater really is.
Are you ready? I'm going to install a physics-based fish finder into your brain.
[Basic Theory] Why are the squid 'there'? The absolute law of biology x fluid dynamics
First, before you stand on a field (breakwater or rocky shore), there is a 'fundamental premise' you absolutely must understand. It is the 'poor fuel efficiency (energy efficiency)' that the bigfin reef squid suffers from.
You might think of squid as 'ninjas' or something that swim freely through the ocean, but biologically speaking, they are 'poorly designed, defective mobile machines'. They don't swim efficiently with tail fins like fish; they move by 'jet propulsion,' sucking in seawater and spraying it out. Do you understand what this means? Compared to fish, the energy consumption (cost) required for movement is ridiculously high.
Squid 'cannot stay' in the current
This is where the physics (fluid dynamics) comes in. Because their fuel efficiency is poor, 'it is impossible for them to stay in a strong current'. If they stay in a torrent for a long time, they'll die from running out of energy before they can even eat.
'So, are they in a stagnant place with no current?' That's also wrong. This is the tricky part, but because bigfin reef squid grow at an abnormally fast rate (reaching several kilograms in a year), they require a large amount of 'oxygen'. They would suffocate in a stagnant place.
● Two contradictory conditions
Dislike current: Because they want to save energy.
Like current: Because they want oxygen and bait (food).
The only place that solves this contradiction. That is the pinpoint called a 'hydraulic refuge'.
Look at the ocean using the 'river stone' theory
I used some difficult terms, but the principle is simple. Remember playing in a river. Where are the fish in a fast-flowing river? "Behind a large rock", right? Because the rock blocks the current, the flow becomes gentle there (saving energy), while a fast current (supplying oxygen and food) passes right by the side. It is a "prime seat for energy conservation" where you can get food by moving just one step."prime seat for energy conservation".
Finding this in the ocean is the entirety of choosing a spot.
For breakwaters: The "back side" of a place where tidal currents collide and create eddies.
For rocky shores: Not the tip of the cape, but the "entrance to the cove" slightly recessed from it.
For surf: A "slit" where a rip current occurs and the terrain is carved out.
Squid aren't using magic to warp. They are clinging to those spots because there is a physical reason why they "can only exist there." If you can see these "boundary lines," you don't need to search the entire ocean. You will be able to strike pinpoint targets.
From here on, I will explain practical ways to find how these "prime seats" hide in specific fields (breakwaters, rocky shores, and surf).
[Breakwater Strategy] Abandon the 'Tip' Faith. The Blue Ocean Spreading at Your Feet
Now, let's get into specific field strategies. First is the most familiar one: the "breakwater." The moment you arrive at a breakwater, don't you just dash toward the "tip (a place with good tidal flow)" without thinking? Like a housewife at a bargain sale.
I'm sorry, but that "tip faith" is the biggest reason you end up skunked (zero catch). It is true that the tip has good tidal flow. It might be good for waiting for migratory fish. But think about it. That is a "fiercely contested area with the highest competition." Someone is throwing an egi from morning till night, the squid are extremely wary, and there is even a possibility they recognize "egi = object of terror."
Moreover, as I mentioned in the previous chapter, bigfin reef squid are creatures with poor fuel efficiency for "jet propulsion." Do you think squid can stay for a long time at the tip where a raging current flows on a spring tide? The answer is NO. They are taking refuge in "energy-saving spots" where they can eat more easily.
What you should target are the "mid-section of the breakwater" or the "area right at your feet" that no one pays attention to. This is where the physically promised paradise lies.
Blind Spot 1: The 'Cafeteria' Known as the Foundation Joint (Slit)
Take a good look at the base of the breakwater. There are concrete blocks (caissons) lined up, right? The "joint (slit)" between those caissons. This is a top-tier spot you are overlooking.
Why? I'll explain it using fluid dynamics. When the tide flowing along a flat wall hits this step (slit) of several centimeters to several tens of centimeters, a subtle "turbulent flow (eddy)" is generated there. This turbulent flow has the function of catching plankton and small fish with weak swimming ability and temporarily retaining them. In other words, a "cafeteria where food gathers" is automatically formed here.
From the squid's perspective, they don't have to go out into the raging current offshore; if they just wander along the wall, a "set meal" is prepared at every slit. This is the reason why a kilo-plus squid is lurking right at your feet, 3m under your rod tip, while you are full-casting offshore.
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Strategy:
Don't cast offshore. Cast parallel to the breakwater (like walking the dog).
Only when passing over a slit, make the fall longer to create a 'pause for the strike'.
Blind Spot 2: The Break in the Channel (Mio-suji)
The next place you should target is the "channel" at the entrance of a fishing port. This is a place that has been artificially dredged so that ships don't scrape the bottom. Here, there is a steep slope (break line) that drops from shallow water to deep water.
For squid, this break is both a "wall" and a "path". When squid in deep water come up to shallow water in search of food, they always move along this slope. Furthermore, the tide hits the edge (corner) of the slope, making it easy for eddies to form.
Even if the tip is full, surprisingly few people cast toward the channel inside the port. Look at the aerial photo on Google Maps. The line where the color of the sea suddenly becomes darker—that is the channel.
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Strategy:
Cast to the "other side (shallower side)" of the break and let the egi sink (curve fall) along the slope.
If there is a moment when the egi feels "light," that is the drop-off of the break. Stay focused.
Blind Spot 3: Only Target the "Boundary Between Light and Shadow" at Streetlights
The staple of night fishing: streetlights. Are you guys casting into the bright light and getting excited about "sight fishing"? ...Are you a child?
The bigger the squid, the more cautious they are. They don't want to enter bright places where their figures are clearly visible as much as possible. So where are they? They are at the "boundary of the darkness" where the light barely reaches. They hide in the darkness, watching the small fish gathered in the light with a predatory gaze.
❌ Bad example: Cast into the bright center to look for squid.
⭕️ Good example: Let it land in the darkness and pull the egi into the bright area.
From "light" to "dark," or from "dark" to "light." Use this change in light intensity (contrast) to trigger the squid's predatory switch.
[Rocky Shore Strategy] High Risk, High Return. A "Survival Strategy" for Stepping into Uncharted Territory
Now, this is where the real work begins. The next place you should aim for, if you are tired of the pressure at embankments, is the "natural rocky shore (ji-iso)".
To be frank, rocky shores are a different world. The stock of squid is so different that it makes you feel foolish for having spent so much time nagging at the wary squid at embankments. "If you cast, they will grab"—this is the only type of field left in Japan where such a dream-like paradise still exists.
But don't get me wrong. A rocky shore is not a place maintained as a "fishing spot." It is raw, exposed nature. If you go with half-baked equipment, instead of a paradise, you will head straight to "the afterlife." Here, I will drill into you the "survival strategy" and "how to find treasure spots" for conquering rocky shores.
[Iron Rule] Don't Come If You Don't Have Spiked Boots and a Life Jacket
First of all, let me say this. Anyone who doesn't have spiked boots and a life jacket has no right to stand on a rocky shore. "Because it's a flat rocky shore that looks like I could go in sneakers"? "Because I can swim, so it's fine"? ...Talk in your sleep elsewhere.
Rocks covered in seaweed are slipperier than ice. If you fall once, your skin will be shredded like grated daikon on the barnacle-covered rock surface. And if you fall into the water, that's it—you'll be tossed around by complex currents and waves, and you'll never make it back up.
In shore eging, these aren't 'recommended gear.' They are your 'entry ticket'. Rods and reels are secondary. First, equip yourself with armor to protect your life. If you don't know which manufacturer is good, read the article I wrote before and come back when you're ready.
🛑 How to Choose 'Armor' to Protect Your Life Are you still trusting your life to a 'cheap life jacket'? If you're serious about shore fishing, get the 'real gear' introduced in this article before you go.
Google Maps is a 'treasure map.' Look here on the aerial photos.
Once your gear is ready, the next step is finding a spot. Ask at a local tackle shop? Check online forums? Old, so old. Take out your smartphone and open Google Maps (Satellite View). This is the ultimate 'treasure map' for the modern eging angler.
You should look for the following two types of terrain in aerial photos.
1. 'Wando (Bays)' and 'Shimori (Black Shadows)' The appeal of rocky shores is their complex, intricate terrain. In particular, 'wando' (bays) where the land curves inward are worth checking. The waves are calm, and bait tends to gather there. And can you see shadows that look like 'black stains' in the water when looking at the photo? Those are 'shimori (submerged rocks)' or 'seaweed beds'. Squid are not in empty sandy areas. They are always attached to these 'black shadows.' If you find a 'bay with scattered black shadows' on Google Maps, that is a guaranteed A-grade spot.
2. 'Cape Tips' and 'Tidal Rips' If a bay is a 'rest area,' the 'cape tip' that juts out into the sea is a 'highway.' Fast offshore currents hit it, bringing bait along. If you're targeting highly active autumn squid or waiting for large migratory squid, the tip of a cape is the only choice. If you see 'whitecaps' at the end of the cape or places where the sea color changes (tidal rips) in the photo, that is proof of intense currents.
💡 Tip: Use them differently depending on the season
・Spring parent squid: They are looking for spawning grounds, so target 'deep in the bay' or 'seaweed beds' where the waves are calm.
・Autumn juveniles: They are swimming around in search of food, so target 'cape tips' or 'bay entrances' with good water flow.
How to distinguish between 'Deadly Shores' and 'Heavenly Shores'
Finally, I'll tell you the characteristics of 'deadly shores' that you must absolutely avoid. Even if you find one on Google Maps and think 'this looks good,' if you go to the site and see the following situations, retreat without hesitation.
The footing is too high (over 5m): You won't be able to land the squid even if you hook one, and if you fall, it's instant death.
There are wet marks high up: Even if it's dry now, it's proof that waves reach that high during high tide or when the surf is high. You'll be swept away by a wave before you know it.
No escape route: There are rocky shores where the path home gets submerged at high tide. Getting absorbed in fishing and realizing you're 'isolated'... that's no laughing matter. Always check the tide table and ensure your safety behind you.
Rocky shores are high-risk, but the rewards are huge. If you approach with fear and respect, you should be able to encounter a 'carpet of squid' that you could never see at a breakwater in your entire life.
[Surf Strategy] Oasis in the Desert: The Equation for "Rip Currents" and "Casting Distance"
Finally, there is the "surf (sandy beach)" that many eging anglers avoid, thinking "there's nothing there." Have you ever looked at a vast sandy beach and felt lost, wondering, "Where am I supposed to cast?" It's true that to a beginner, a surf zone with no visible structures looks like nothing more than a "desert."
But, adopt a counter-intuitive mindset. "Because the changes are hard to see, there are zero rivals." On a vast, empty beach, you can have a fresh school of migrating squid all to yourself. This is the true thrill of surf eging.
To avoid getting lost in the desert, you need two compasses: "rip currents" and "overwhelming casting distance."
Find the Rip Current = The Squid's Highway
At first glance, the surf looks the same everywhere. But think about it in terms of physics. Where does the "massive amount of seawater washing onto the shore" go? It can't just keep piling up, right? There must be a "flow returning to the open sea" somewhere. This is the "rip current."
This rip current is the only and strongest structure in the surf. As the strong current heads offshore, it digs into the bottom sand to create a "trench (slit)," where plankton are carried, small fish gather, and bigfin reef squid congregate to hunt them. In other words, it is both a "squid-exclusive highway" and a "cafeteria."
Look at the sea surface and search for the following "anomalies." Those are the signs of a rip current.
● 3 Visual Signs to Find a Rip Current
Breaks in the white water: While waves are crashing everywhere else, is there a place "where the waves aren't breaking (it's calm)"? That is proof that the water is deep and there is a flow heading offshore.
Surface agitation: Is the surface rippling or a different color only in that specific spot?
Movement of debris: Is there a place where foam or debris floating on the surface is "flowing toward the open sea" instead of washing ashore?
If you find even one of these, that is the entrance to paradise. Don't just cast mindlessly. Walk the beach and don't cast until you find this "physical singularity."
"Casting distance" is justice. If you can't reach them, it's the same as if they don't exist.
Even if you find a rip current, there is another high wall in the surf. That is the topographical feature known as "shallow water (to-asa)."
Unlike breakwaters or rocky shores where the water is deep right at your feet, in the surf, it's common for the water to be only a few dozen centimeters deep even several meters out. The break line (the drop-off to deep water) where squid can swim with peace of mind is often far offshore. In other words, here, "no casting distance = you can't even get to the starting line."
If you're just making casual casts with the 8.3ft rod you use on breakwaters, you're not even in the game. To win in the surf, a "9ft-class long rod" and the "pendulum cast" to fully load the rod are essential skills.
🚀 Extending Casting Distance with Physics If your cast is only about 50m, going to the surf is a waste of gas. First, master this casting method where you lengthen the "drop" to draw out 100% of the rod's elasticity.
Explore the surf as a 'surface,' not a 'point'
Finally, let's talk tactics. Once you find a 'line' like a rip current, it's natural to focus your efforts there, but squid in the surf migrate over a wide area. Don't stick to one spot. 'Fan casting' If you don't get a reaction, move 10 meters to the side. Repeat this and keep walking until you hit a school of squid.
Surf eging isn't a waiting game. It's a 'hunt where you earn it with your feet'. The thrill of finding your own 'treasure (rip current)' on a vast sandy beach is something you can never experience on a crowded breakwater.
[Seasonal Equation] 'Spring Spawning' vs. 'Autumn Predation.' Change your terrain priorities
Lastly, let me install one more important variable. That is 'season'. I've mentioned things like 'the tip of the breakwater is good' or 'coves are good,' but the correct answer changes 180 degrees depending on the season.
Think of bigfin reef squid as 'completely different creatures' in spring and autumn. Their OS (behavioral principles) has been completely rewritten.
Spring (Parent Squid): Keywords are 'spawning' and 'safety'
In spring, parent squid grow to over a kilogram and come inshore to mate and spawn. At this time, their minds are filled more with 'leaving offspring' than with appetite. Therefore, they dislike strong currents and open areas with many predators.
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Terrain to target:
Back of a cove: Places with calm waves and 'seaweed beds (eelgrass/sargassum)' where they can lay eggs.
Shallows adjacent to deep water: Places with depth changes where they can quickly escape to deep water if they feel danger.
It's nonsense for someone to be casting wildly at the 'tip of a breakwater with good tidal flow' in the spring. Parent squid don't nurture their love in such restless places.
Autumn (Juveniles): Keywords are 'curiosity' and 'competition'
Conversely, autumn juveniles are 'lumps of appetite'. To grow, they have to eat massive amounts of food. Moreover, they have to win the food-grabbing battle against their siblings or they'll starve to death.
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Terrain to target:
Slopes inside fishing ports: Places where small fish are easily cornered.
Breakwater tips and tide lines: A conveyor belt where fresh food flows by one after another.
It's inefficient to only target seaweed beds in the autumn. If there's food, they'll charge right in, even if the current is somewhat fast or it's a boat channel.
💡 Conclusion
In spring, target 'defensive' terrain (seaweed beds, coves). In autumn, target 'offensive' terrain (areas with good tidal flow, inside ports).
Summary: Fishing spots are not something you 'choose,' but something you 'find.'
I've talked at length, but by now you should be freed from the superstition that 'crowded = productive.' A fishing spot isn't something you find by typing into a search bar. It's something you 'seek out' using your own feet, Google Maps, and physical knowledge.
If you consider the squid's energy efficiency (fluid dynamics), 'the back side of the current' becomes visible.
If you look at a map (aerial photo), 'a paradise where people don't go' becomes visible.
If you know the season (biology), 'the place you should go now' can be narrowed down.
The time you spent lamenting toward the sea, asking 'Why can't I catch anything?', is over. From now on, you'll be able to grin when looking at a map app, thinking, 'Oh, there's definitely a school of squid here.'
The value of that one squid you caught by forming a hypothesis in your own head, walking a rugged rocky path, and hitting the pinpoint target you aimed for is far greater than ten squid caught by pure luck on a crowded breakwater. Now, close your smartphone and open the map. Your own 'blue treasure' is right there.
🛑 Don't be satisfied yet. This is just the 'tip of the iceberg'.
The know-how introduced this time is merely 'a single piece' to solving the giant puzzle that is eging. When all the answers—'Why this tool?', 'Why this location?'—connect and form a single line, you will finally graduate from being a 'luck-based angler'.
The 'textbook' of all 21 chapters I have written covers 'every logic' for conquering bigfin reef squid, from biology to physics and even culinary quality.
Be sure to bookmark this article as a 'map' for when you get lost.
▼ Complete Eging Strategy Guide | A Textbook for Catching Bigfin Reef Squid with Science and Logic (All 21 Chapters)
Frequently Asked Questions (FAQ)
Finally, I will preemptively answer the questions that you logical folks might have.
Q1. When I arrive at a new place, what should I look at first?
Conclusion: Put your smartphone away and look at the 'wind direction' and 'bait (small fish)'.
No matter how good the terrain is, you can't fish in a gale-force headwind, and if there's no bait, there are no squid. First, confirm 'if fishing is feasible (wind),' then visually check 'if there is a sense of life (bait).' If these two are okay, then you can start analyzing the 'terrain,' such as the color of the sea and the flow of the tide. Anyone who casts their rod immediately is an amateur.
Q2. Is night fishing on rocky shores dangerous? Should a beginner go?
Conclusion: A beginner going to a rocky shore alone at night is essentially a 'suicide mission.' Absolutely do not do it.
At night on rocky shores, your sense of distance gets distorted, and you can't see wet rocks. Even for an experienced angler like me, exploring a new spot at night is scary. If you absolutely must go, make sure to scout the location (check the entry point) during the day beforehand. The height of the footing, the path back, and the line where waves wash over—memorize these while it's still bright before you head out at night. Your life is more important than fishing.
Q3. Are places with squid ink marks on the ground good for fishing?
Conclusion: It proves that fish can be caught there, but you need to profile 'when' those marks were made.
Ink marks are solid evidence that a squid was there. However, it makes a big difference whether they are from 'yesterday' or 'a month ago.' If the ink is pitch black and not dry, there's a high chance, but if it's whitish and weathered, it's just 'past glory.' In fact, places covered in ink marks are likely under high pressure and the squid are probably wary. Personally, rather than casting right next to the ink marks, I would look for a 'neighboring spot with similar terrain' that doesn't have any ink marks.